aSection of General Surgery, Department of Surgery, University of Michigan, Ann Arbor, MI, USA Correspondence address: Michael W Mulholland, MD, PhD, FACS, Department of Surgery, 2920B Taubman Center, Box 0331, 1500 East Medical Center Dr, Ann Arbor, MI 48109-0331 Submitted April 20, 2000; accepted May 24, 2000.
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