PITTSBURGH - A federal judge in Pennsylvania on May 7 permitted purchasers of health insurance from Highmark Inc. to withdraw their motion for preliminary approval of their settlement with Highmark of their antitrust claims, where the purchasers argued that Highmark failed to disclose information that demonstrated that the value of the proposed settlement was illusory (Royal Mile Company, Inc., et al. v. UPMC, et al. No. 2:10-cv-01609, W.D. Pa.).