title: Silent contracts and silent PPOs.
authors.forename: D L
authors.initials: DL
authors.lastname: Elden
mesh_terms: D003284:Contract Services / Q000458:organization & administration*; D005251:Fees, Medical; D006801:Humans; D017008:Negotiating; D011243:Preferred Provider Organizations / Q000331:legislation & jurisprudence*; D014481:United States