The status of PPOs in 1992:  results of the first annual AAPPO Journal survey.
Health Care Communications, Inc., Fort Lee, New Jersey.
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Dietze
D000068:Accreditation; D004493:Education; D005544:Forecasting; D005569:Formularies as Topic; D006801:Humans; D007356:Insurance, Pharmaceutical Services; D011243:Preferred Provider Organizations / Q000191:economics / Q000706:statistics & numerical data* / Q000639:trends; D011795:Surveys and Questionnaires