title: Coping with tough markets: doctors battle a health plan monopoly.
authors: Wayne J
authors: WJ
authors: Guglielmo
mesh_terms: D003363:Cost Control; D006123:Group Practice; D019981:Health Care Sector / Q000458:organization & administration* / Q000639:trends; D006801:Humans; D007193:Independent Practice Associations; D007349:Insurance, Health, Reimbursement; D007357:Insurance, Physician Services / Q000639:trends*; D015143:Philadelphia; D011216:Practice Management, Medical / Q000191:economics*; D014481:United States