Hospital policy: professional associations as unions.
D000041:Absenteeism; D000288:Administrative Personnel; D005381:Financing, Organized; D006739:Hospital Administration; D006761:Hospitals / Q000706:statistics & numerical data; D007182:Income; D007603:Jurisprudence; D007750:Labor Unions; D007878:Legislation as Topic; D012952:Societies; D012956:Societies, Nursing; D014481:United States