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MAP20071505058Green, MegBig, better, best? / by Meg GreenEven as some insurers gain national size through mergers and acquisitions, competition is still a local battle. The number of health maintenance organizations in the country dropped 30% from 1999 to 2003, falling from 643 to 454, according to Interstudy Publications, whihc tracks the entities holding HMO licenses in their state of primary operation. Tables: The 11 largest insurance company managed care deals since 1997; largest public managed care companies by revenue 2002-2003En: Best's review. - Oldwick, New Jersey. - March 2004 ; p. 78-831. Seguro de asistencia sanitaria. 2. Estados Unidos. 3. Mercado de seguros. 4. Fusión de empresas. 5. Ranking. I. Título. II. Título: Best's review.