BRICKLEY, J.

This case arises out of an action for medical malpractice involving the death of twenty-year-old Janet Vargo after she gave birth to her son at St. Lawrence Hospital in Lansing. Plaintiff, as personal representative of the estate of Janet Vargo, asserted that defendant-appellee Dr. Harold Sauer, a Michigan State University medical professor who instructs medical residents and treats patients at St. Lawrence, negligently caused Ms. Vargo's death. Dr. Sauer moved for summary disposition, arguing that he was entitled to immunity pursuant to subsection 7(2) of the governmental tort immunity statute. Plaintiff responded that Dr. Sauer did not satisfy the requirements of subsection 7(2) and that, in any event, subsection 7(4) does not grant immunity to agents of government hospitals. The trial court dismissed plaintiff's claim on the basis of governmental immunity and a divided Court of Appeals affirmed the dismissal. We accepted review to consider 1) whether the hospital exception is constitutional and, if it is, whether it governs this case, and 2) whether a question exists to submit to the jury in regard to whether Dr. Sauer is entitled to immunity under subsection 7(2).

On the first question, we find that although the hospital exception is not constitutionally infirm, it does not control our disposition of this case. On the second question, we hold that the trial court's dismissal of this action was premature because a factual issue was presented with respect to whether Dr. Sauer was acting "in the course of [his] employment" solely on behalf of MSU or whether he was simultaneously operating as an agent of St. Lawrence Hospital. We therefore reverse the trial court's grant of summary disposition, and remand this case to the circuit court for further proceedings limited to plaintiff's claim of medical malpractice arising from Dr. Sauer's relationship with St. Lawrence Hospital.

I

The material facts appearing in the record establish that on the morning of July 3, 1990, twenty-year-old Janet Vargo visited St. Lawrence Hospital complaining of difficulties associated with her pregnancy. After an electrocardiogram examination indicated an irregular heart rate, the hospital staff instructed Ms. Vargo to visit the office of her personal physician, Dr. James Rawlinson. Dr. Rawlinson examined her and, after her complaints of chest tightness and shortness of breath persisted, instructed her to return to St. Lawrence. Ms. Vargo was subsequently admitted to St. Lawrence, where she was examined by, among others, medical residents from the Michigan State University Medical School. Later that evening, Dr. Rawlinson consulted with defendant-appellee Dr. Harold Sauer, who was "on call" at St. Lawrence, in regard to Ms. Vargo's condition. Dr. Sauer examined Ms. Vargo, arranged for an immediate Cesarean section, and at 12:29 A.M., a healthy boy was delivered. Shortly after the delivery, however, Ms. Vargo developed severe bradycardia and cardiac arrest, and lapsed into a comatose state where she remained until the removal of life support approximately six weeks later.

Defendant-appellee Dr. Harold Sauer has been an associate professor in obstetrics, gynecology and reproductive biology with the Michigan State University College of Human Medicine since 1985, and in this capacity instructs medical students and residents. MSU's status is unique among the universities providing medical schools in Michigan. Unlike Wayne State University and the University of Michigan, both of which operate hospitals as an adjunct to their medical school, MSU lacks its own hospital facility and consequently operates its residency program through privately owned hospitals such as St. Lawrence. Apparently in exchange for the use of these facilities, MSU physicians provide services on a rotation or "on call" basis. MSU medical faculty receive a fixed annual salary from MSU and the affiliated hospitals pay MSU the patient fees generated by MSU faculty and residents.

The present case concerns the "Michigan State University/St. Lawrence Hospital Family Practice Residency Program" at the privately owned St. Lawrence Hospital. Although the specifics surrounding the affiliation between MSU and St. Lawrence are unclear, the record establishes that Dr. Sauer had staff privileges at St. Lawrence and provided in-patient medical care and treatment to private patients there.

Plaintiff commenced this suit for medical malpractice in Ingham Circuit Court in January 1992 against St. Lawrence Hospital, Dr. Rawlinson, and Dr. Sauer. St. Lawrence settled the claim for $700,000, and Dr. Rawlinson was dismissed with prejudice by stipulation of the parties. Plaintiff's complaint alleged that Dr. Sauer negligently failed to diagnose Ms. Vargo's congestive heart failure, thereby resulting in massive cardiorespiratory arrest during childbirth.

During the course of litigation, Dr. Sauer filed a motion for summary disposition on the basis that, as an employee of MSU, he was entitled to immunity under subsection 7(2). Plaintiff responded that subsection 7(4), rather than subsection 7(2), controls the present case. Plaintiff contended that the arrangement between MSU and St. Lawrence makes MSU an "operator" of a government hospital, thereby triggering the hospital exception to immunity. Plaintiff also argued that notwithstanding subsection 7(4), the activity that gave rise to the claim of medical malpractice did not take place during "the course of employment" nor "on behalf of a governmental agency," pursuant to subsection 7(2)'s mandate.

In May 1993, the trial court granted Dr. Sauer's motion for summary disposition pursuant to MCR 2.116(C)(7) (immunity granted by law), and MCR 2.116(C)(10) (no genuine issue of material fact), finding:

Dr. Sauer is a governmental employee. He was acting within the scope of his employment. His sole remuneration comes from the university. He responded to a call to the Michigan State University OB/GYN clinic.

There were residents involved in this case. It is a necessary portion or part of his employment that, in addition to the teaching function, the direct and what I will term as a classroom or pedagogical type of function, he also maintained his skill level. So, I have no trouble in finding that this is within the scope of his employment.

Judge Houk expressed some reluctance with his ruling, observing that the hospital exception treated patients of MSU physicians differently than those treated by other university-employed physicians.

Before the entry of final order, plaintiff moved that Dr. Sauer produce contractual and other documentary evidence relating to the relationship between St. Lawrence Hospital and MSU. Judge Houk summarily denied the request and entered the order granting summary disposition.

On appeal, plaintiff asserted that a grant of immunity under subsection 7(2) was improper because Dr. Sauer's treatment of Ms. Vargo was not undertaken on behalf of MSU nor did it involve the performance of a governmental function. Plaintiff also argued that MSU "operated" a hospital pursuant to subsection 7(4) and that, in the alternative, the hospital exception violates the Equal Protection Clause of the Michigan Constitution because it "fails to treat all university-employed physicians [in Michigan] in a like manner with regard to governmental immunity."

A divided Court of Appeals rejected plaintiff's arguments and affirmed the trial court's dismissal, ruling that Dr. Sauer was entitled to the defense of governmental immunity. 215 Mich. App. 389; 547 N.W.2d 40 (1996). We granted leave to appeal, and now reverse the decision of the Court of Appeals.

II

We begin with the fundamental principle that governmental agencies are statutorily immune from tort liability "[e]xcept as otherwise provided." In Ross v. Consumers Power Co (On Rehearing), 420 Mich. 567, 618; 363 N.W.2d 641 (1984), we characterized § 7 as a "broad grant of immunity" subject to "narrowly drawn statutory exceptions." Although the general effect of the 1986 amendments to the governmental tort liability act was to preserve, and in some instances to expand, the immunity available to governmental agencies and their employees, the amendments also created a fifth exception to immunity. As spelled out above, subsection 7(4) specifically allows tort liability to be imposed on a governmental agency other than the Department of Mental Health or Department of Corrections for injuries arising out of the ownership or operation of a public hospital or county medical facility. Since Ross, this Court has repeatedly affirmed the proposition that statutory exceptions to governmental immunity are to be narrowly construed.

A

We first consider plaintiff's argument that the hospital exception to immunity controls the present case. Plaintiff contends that the legislative purpose in enacting subsection 7(4) was to exempt the entire practice of medicine from the otherwise broad grant of governmental immunity under subsection 7(2). In furtherance of this argument, plaintiff insists that the Legislature did not intend to extend governmental immunity to a physician employed by MSU.

Subsection 7(4) exempts from immunity governmental agencies that own or operate a "hospital" or "county medical care facility." Plaintiff does not allege that a county medical care facility is involved, and therefore her argument depends on whether a residency program qualifies as a "hospital."

The rules of statutory construction are well established. First and foremost, we must give effect to the Legislature's intent. Reardon v. Dep't of Mental Health, 430 Mich. 398, 412; 424 N.W.2d 248 (1988). If the language of a statute is clear and unambiguous, the plain meaning of the statute reflects the legislative intent and no further construction is required or permitted. Turner v. Auto Club Ins Ass'n, 448 Mich. 22, 27; 528 N.W.2d 681 (1995). However, when a statute specifically defines a given term, that definition alone controls. Tryc v. Michigan Veterans' Facility, 451 Mich. 129, 135; 545 N.W.2d 642 (1996). Applying these principles, the definition of "hospital" supplied in the statute, being clear and unambiguous, controls.

A "hospital," as defined in subsection 7(4)(b) means:

[A] facility offering inpatient, overnight care, and services for observation, diagnosis, and active treatment of an individual with a medical, surgical, obstetric, chronic, or rehabilitative condition requiring the daily direction or supervision of a physician.

A review of the record indicates that MSU's residency program does not "offer inpatient, overnight care" or related services and therefore does not fall within the meaning of "hospital" as defined by the statute. Thus, while MSU may operate a residency program, we do not find that MSU is an operator of a hospital. Accordingly, we uphold the Court of Appeals determination that the hospital exception does not apply in this case.

B

Plaintiff also challenges the constitutionality of subsection 7(4), arguing that the hospital exception violates equal protection guarantees because it treats patients treated by MSU physicians working at private hospitals differently from those treated by all other university-employed physicians. More specifically, plaintiff maintains that the hospital exception, when viewed in the context of MSU's unique arrangement with local private hospitals, creates a situation in which similarly situated patients are subjected to disparate rights of recovery.

Our state constitution declares that "[n]o person shall be denied the equal protection of the laws. . . ." We have interpreted our Equal Protection Clause to offer similar protection as the wording of the parallel clause in the United States Constitution. Doe v. Dep't of Social Services, 439 Mich. 650, 660; 487 N.W.2d 166 (1992). The United States Supreme Court's constitutional jurisprudence teaches that an "equal protection analysis requires strict scrutiny of a legislative classification only when the classification impermissibly interferes with the exercise of a fundamental right or operates to the peculiar disadvantage of a suspect class." Because, there is no fundamental right or suspect classification involved, the rational-basis standard of review governs in the present case. We uphold a statute under that standard if it furthers a legitimate governmental interest and if the challenged classification is rationally related to achieving that interest. Michigan State AFL-CIO v. MERC, 453 Mich. 362, 381; 551 N.W.2d 165 (1996). Legislation challenged on equal protection grounds is accorded a presumption of constitutionality, and our inquiry is therefore "'restricted to the issue whether any state of facts either known or which could reasonably be assumed affords support for it.'" Shavers v. Attorney General, 402 Mich. 554, 613-614; 267 N.W.2d 72(1978).

Although there is some resonance to plaintiff's perceptions regarding the "unfairness" of the hospital exception, we find that subsection 7(4) passes constitutional muster, albeit for a different rationale than the one advanced by the Court of Appeals. In response to plaintiff's contention that subsection 7(4) was violative of equal protection, the Court of Appeals stated:

[T]he statutory scheme is nonetheless rationally related to a legitimate governmental purpose: i.e., the state will permit governmental employees to be sued in tort where they presumably have input regarding control over operations at the government-run hospital where the alleged malpractice occurs. Thus, governmental employees working at private hospitals as part of their governmental function who have no input or control regarding hospital operations cannot be sued for malpractice occurring at the private hospital. Also, extending immunity to physicians under these circumstances encourages medical schools to become involved in providing medical care in their communities when the school does not own or operate its own hospital or medical facility. 215 Mich. App. 397 (citations omitted).]

According to the Court of Appeals, the Legislature had a rational basis for providing disparate rights of recovery from physicians of differing public schools because physicians "presumably" have "input or control" at a government-run hospital. We are unable to agree with this analysis because subsection 7(4) states:

This act does not grant immunity to a governmental agency with respect to the ownership or operation of a hospital . . . or to the agents or employees of such hospital. . . .

A facial examination of the foregoing language reveals that a physician employed by a government hospital who treats a patient at a private hospital is also not immune under the act, despite the fact that the governmental agency presumably has no "input or control" over the operations of the private hospital. The same is not true for MSU physicians under the rationale advanced by the Court of Appeals, because such individuals may be entitled to immunity at both a public hospital and a private hospital, with immunity in each instance premised on the fact that MSU does not own or operate its own hospital. That is, even under an "input and control" rationale, the act still abrogates immunity for a government-employed physician treating patients at a private hospital, even though that physician presumably has no input or control over the private hospital solely on the basis that the physician's "primary employer," such as the University of Michigan, happens to own its own hospital. In light of those considerations, we cannot support the rationale proffered by the Court of Appeals.

Notwithstanding our disagreement with the Court of Appeals rationale, we find more plausible the assertion advanced at oral argument by counsel for Dr. Sauer that the Legislature may have decided that state-supported medical schools that choose to own or operate their own hospital, thereby presumably receiving a large source of revenue from operation of that hospital, would not receive, along with state funding, the additional benefit of governmental immunity that is normally available under subsection 7(2). We agree that the Legislature may have decided not to extend immunity to those agencies who choose to own and operate their own hospitals because they presumably are in a better position to offer their employees, among other benefits, liability insurance. Mindful of the presumption of constitutionality and the accompanying limited inquiry we give statutes such as the one that is being challenged here, Shavers, supra at 613-614, we find that there is a rational basis for the disparate rights of recovery under the governmental tort immunity statute. Accordingly, we hold that subsection 7(4) does not deprive plaintiff of equal protection of the law.

III

We now consider Dr. Sauer's argument that he is entitled to immunity under subsection 7(2) of the governmental tort immunity act. As set out above, subsection 7(2) provides immunity from tort liability to an individual who is an "employee of a governmental agency" and who causes injury "while in the course of employment." The governmental agency by whom the individual is employed must also be "engaged in the exercise or discharge of a governmental function" before immunity may be invoked. In the present case, the parties do not dispute that the cloak of governmental immunity is "alive and well" in Michigan, but rather dispute whether that cloak is large enough to encompass Dr. Sauer. A divided Court of Appeals upheld the trial court's dismissal of plaintiff's claim. The majority concluded that Dr. Sauer is entitled to immunity because he was performing a governmental function on behalf of a governmental agency at the time of the alleged negligence, while the dissent opined that dismissal of the claim was premature because a factual question existed with respect to whether Dr. Sauer was simultaneously "an agent of St. Lawrence Hospital" at the time of the alleged negligence.

As prologue to our inquiry into whether Dr. Sauer is entitled to immunity, we note that for purposes of the present action, subsection 7(2) contemplates the satisfaction of two elements before Dr. Sauer may be cloaked with governmental immunity: first, whether Dr. Sauer was engaged in a "governmental function" at the time of the alleged negligence and, if so, whether his performance of that function was "on behalf of a governmental agency."

A

Plaintiff argues that Dr. Sauer was not performing a governmental function when he treated Janet Vargo. We disagree. In Ross, supra at 620, we held that a "governmental function" is an activity that is expressly or impliedly mandated or authorized by constitution, statute, or other law. At that time, we expressly recognized that the definition we formulated was so broad that it would encompass most activities that a government might undertake. Id. at 620-621. In 1986, the Legislature codified the definition we set forth in Ross:

"Governmental function" is an activity which is expressly or impliedly mandated or authorized by constitution, statute, local charter or ordinance, or other law. [MCL 691.1401(f); MSA 3.996(101)(f).]

Significantly, the Legislature did not limit the Ross definition in any respect, and in fact broadened the definition by adding "local charter or ordinance" to the list of definitional sources of legal authority from which immunity may spring.

It is undisputed that MSU, as an extension of the state, generally is entitled to invoke sovereign immunity. Under MCL 390.101; MSA 15.1121, Michigan State University is directed to

provide the inhabitants of this state with the means of acquiring a thorough knowledge of . . . science . . . and to this end it shall afford such instruction in science, art and literature as, in the judgment of its governing body, will promote the object of the institution.

Pursuant to this authority, the MSU Board of Trustees established the MSU College of Human Medicine in 1964.

Affidavits submitted by MSU establish that it is the judgment of MSU that a vital part of providing a medical education is hands-on experience and that it is necessary for its faculty and medical residents to be exposed to the patient population at hospitals such as St. Lawrence. The broad language of MCL 390.101; MSA 15.1121 confers on MSU the power to teach medicine and therefore qualifies as a "governmental function," and we believe that common sense dictates that teaching and rendering medical care are necessarily intertwined in a medical school setting. Because the parameters of governmental immunity pursuant to the governing statute clearly contemplates a broad reading of "governmental function," we accordingly find that Dr. Sauer was performing a governmental function during the relevant period of the alleged negligence.

B

Although we have determined that Dr. Sauer was performing a "governmental function" for purposes of the immunity statute, our inquiry is not complete, as subsection 7(2) also mandates an examination of the employment status of the individual seeking immunity. By its very terms, subsection 7(2) grants immunity only to an individual who is an "employee of a governmental agency . . . while in the course of employment."

The governmental tort liability act defines "governmental agency" as

the state, political subdivisions, and municipal corporations. [MCL 691.1401(d); MSA 3.996(101)(d).]

We agree with the Court of Appeals dissenting opinion that the definition of "governmental agency" does not include, or remotely contemplate, joint ventures, partnerships, arrangements between governmental agencies and private entities, or any other combined state-private endeavors.

Consistent with that consideration, we note that it is axiomatic that an individual may serve two masters simultaneously. This principle found its genesis in our jurisprudence well over a century ago and has achieved contemporary expression in the Restatement (Second) of Agency and a number of other authorities. The Restatement's hornbook rule states:

A person may be the servant of two masters, not joint employers, at one time as to one act, if the service to one does not involve abandonment of the service to the other. [1 Restatement Agency, 2d, § 226, p 498 (emphasis added).]

According to the comments to § 226, dual agency occurs when two persons or entities agree to share the services of an individual for a single act. It is also well established that a physician may have a dual employment status and therefore be subject to the general laws of agency. Barnes v. Mitchell, 341 Mich. 7, 19; 67 N.W.2d 208 (1954).

We believe that the general rules of agency as set forth in our jurisprudence and the Restatement remain sound and, as a basic principle, should be applied to the hospital setting in the same manner as any other employment setting. By logical extension, we see no reason why their application to individuals such as faculty members providing instruction and treatment in a hospital should not be applied with the same rigor as they are to other hospital employees who may also be performing for two principals. We find that the principles related to dual agency are analogous to the realities of hospital employment in general and, in particular, to the factual situation in the present case.

C

In the present case, it is uncontested that Dr. Sauer had staff privileges at St. Lawrence and regularly treated patients there. The record also indicates that Janet Vargo was admitted to St. Lawrence Hospital and treated by Dr. Sauer during the period of the alleged negligence. Finally, Dr. Sauer's motion for summary disposition asserted that he provided consultative services through the "Michigan State University/St. Lawrence Hospital Family Practice Residency Program."

The circuit court granted Dr. Sauer's motion for summary disposition pursuant to MCR 2.116(C)(7) (governmental immunity), and MCR 2.116(C)(10) (no genuine issue of material fact). In deciding a motion for summary disposition on the basis of governmental immunity, a court must consider all documentary evidence filed or submitted by the parties. Patterson v. Kleiman, 447 Mich. 429; 526 N.W.2d 879 (1994). Dr. Sauer's motion for summary disposition on the basis of governmental immunity stated that he "provide[d] consultative services through the Michigan State University/St. Lawrence Hospital Family Practice Residency Program." Under MCR 2.116(C)(10), summary disposition is appropriate only where there is no genuine issue of material fact. However, where there is a disputed question of agency, any evidence, either direct or inferential, which tends to establish an agency relationship creates a question of fact for the jury to determine. The facts of this case, with respect to the purported agency relationship between Dr. Sauer and St. Lawrence, have yet to be developed. As the case now stands, it cannot be said as a matter of law that an agency relationship did not exist and therefore a question exists to submit to the jury regarding whether Dr. Sauer retained such a relationship with St. Lawrence, a nongovernmental entity.

D

We emphasize that our consideration of subsection 7(2) as it pertains to the instant case does not alter the important policy directive mandated by the Legislature when it enacted the governmental tort immunity statute. Rather, our examination of the governmental tort immunity statute reveals that although the Legislature extended immunity to a large number of individuals for broad categories of conduct, there is no indication that the statute, when read in conjunction with its definitional sources, even remotely contemplates a grant of immunity for agents who are simultaneously serving a private entity.

IV

Consistent with the foregoing considerations, and accepting plaintiff's well-pleaded allegations, we hold that a material question of fact remains for trial. The record establishes that Dr. Sauer had staff privileges at St. Lawrence Hospital, treated a number of private patients there on an "on call" basis, and at the time of the alleged negligence was treating Janet Vargo as a private patient at the "Michigan State University/St. Lawrence Family Practice Residency Program." We believe that irrespective of Dr. Sauer's performance of a governmental function, a question of fact exists with regard to whether Dr. Sauer was simultaneously operating as an agent of St. Lawrence Hospital. Therefore, and in accordance with the Court of Appeals dissenting opinion, we reverse the judgment of the Court of Appeals and remand this case to the circuit court for further proceedings limited to plaintiff's claim of medical malpractice arising from Dr. Sauer's activities as an agent of St. Lawrence Hospital or the Michigan State University/St. Lawrence Family Practice Residency Program.

MALLETT, C.J., and BOYLE, WEAVER, and TAYLOR, JJ., concurred with BRICKLEY, J.