title: Dr. Michael O'Shea gives his opinion of the reason why HMO's exist.
authors.forename: B J
authors.initials: BJ
authors.lastname: Keller
mesh_terms: D003256:Community Participation; D003729:Dental Care / Q000191:economics; D017049:Employer Health Costs; D006264:Health Benefit Plans, Employee / Q000191:economics; D006279:Health Maintenance Organizations / Q000191:economics; D006801:Humans