?:authorAffiliation
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[\'Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania.\', \'Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.\', \'Harvard Medical School and Brigham and Women\'s Hospital, Boston, Massachusetts.\', \'University of Michigan, Ann Arbor, Michigan.\', \'Weill Cornell Medical College, New York, New York.\', \'University of California, San Francisco, California.\']
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