title: HMO formularies and care costs.
authors.forename: D
authors.initials: D
authors.lastname: Ross-Degnan
authors.forename: S B
authors.initials: SB
authors.lastname: Soumerai
mesh_terms: D003363:Cost Control; D016527:Drug Costs; D004363:Drug Utilization; D006279:Health Maintenance Organizations / Q000191:economics*; D006801:Humans