a Department of Surgery, Juntendo University Urayasu Hospital, Chiba, Japan *Correspondence address: Toshiaki Iba, MD, Department of Surgery, Juntendo University Urayasu Hospital, 2-1-1 Tomioka Urayasu, Chiba 279, Japan Received November 6, 1997; revised March 17, 1998; accepted April 23, 1998.
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Iba et al. (1998) studied this question.