title: The right to change tracks.
authors: J W
authors: JW
authors: Mills
mesh_terms: D000574:American Medical Association; D054598:Blue Cross Blue Shield Insurance Plans / Q000191:economics; D008329:Managed Care Programs / Q000331:legislation & jurisprudence; D010414:Pennsylvania; D010506:Periodicals as Topic / Q000592:standards*; D014481:United States