title: Participation in joint ventures, PPOs and IPAs may threaten pension plans.
mesh_terms: D006739:Hospital Administration / Q000191:economics*; D006754:Hospital Restructuring / Q000191:economics*; D006801:Humans; D008505:Medical Staff, Hospital; D010415:Pensions; D013660:Taxes / Q000331:legislation & jurisprudence; D014481:United States