aDepartment of Surgery, University of Pennsylvania School of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA Correspondence address: Larry R Kaiser, MD, FACS, Department of Surgery, Hospital of the University of Pennsylvania, 3400 Spruce St, 4 Silverstein, Philadelphia, PA 19104 Submitted and accepted October 29, 1999.
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Larry R. Kaiser (2000) studied this question.