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In any case, such healthcare integration is occurring at a breakneck pace all across the nation, with endless permutations: Hospitals are buying doctors’ practices and surgery and imaging centers. Insurers are buying doctors’ practices and specialty pharmacies and sometimes merging with pharmacy chains. Hospitals are buying or creating insurers. Private equity firms are behind many of the deals, buying practices, reorganizing operations, paring costs, then selling at a profit in a few years to a hospital or insurer higher up the healthcare food chain.