title: Feds widen probe. 'Most-favored nation' clauses draw more scrutiny.
authors.forename: Melanie
authors.initials: M
authors.lastname: Evans
mesh_terms: D016363:Antitrust Laws; D005249:Fees and Charges / Q000331:legislation & jurisprudence*; D033161:Government Regulation; D006761:Hospitals; D007348:Insurance, Health / Q000191:economics*; D014481:United States