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A Prospective, Randomized Evaluation of Prophylactic Intraaortic Balloon Counterpulsation in High Risk Patients With Acute Myocardial Infarction Treated With Primary Angioplasty fn1fn1Funding for this study was provided in part by unrestricted grants from Advanced Cardiovascular Systems, Inc., Santa Clara, California; Mallinkrodt Medical, Inc., Saint Louis, Missouri; Datascope Corporation, Montvale, New Jersey; St. Jude Medical, Chelmsford, Massachusetts; and Siemens Corporation, Iselin, New Jersey.