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Antitrust agony. In wake of the latest federal action, four hospital mergers are being proposed. The players wait to see if their deals pass muster.

Four potential mergers could face some tough scrutiny from federal regulators in the wake of a recent case in Illinois. The Evanston Northwestern Healthcare case, in which the FTC forced the system to separately negotiate managed-care contracts for the acquired hospital, "make it more likely" the FTC will investigate, says Chul Pak, left, a former FTC lawyer who worked on that case.