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U.S. antitrust authorities said on Tuesday they approved plans by Primedex Health Systems Inc. (PMDX.OB: Quote, Profile, Research) to buy imaging center operator Radiologix Inc.(RGX.A: Quote, Profile, Research).Officials have completed their investigation of the deal without taking any action, the Federal Trade Commission said in a notice. Los Angeles-based Primedex, which runs diagnostic imaging centers …

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