The Secretary of Health is hereby authorized to develop the system herein provided by stages. These stages may be on the basis of population or regional groups or by services, according to his best judgment, in a final or an experimental manner.
History —June 21, 1969, No. 56, p. 100, § 12; July 23, 1974, No. 232, Part 2, p. 205, § 2; June 28, 1978, No. 82, p. 262, § 2.