aDepartment of Surgery, Brown University, School of Medicine, Rhode Island Hospital, Providence, RI 02903, USA FACS *Correspondence address: Philip A Philips, MD, 20 Cumberland Hill Rd, Woonsocket, RI 02895 Received July 11, 2000; Revised October 25, 2000; Accepted October 30, 2000. No competing interests declared.
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Philips et al. (2001) studied this question.