(1) Department of Surgery, Kitami Central Hospital, 383 Tonden-Higashi-machi, Kitami-shi, Hokkaido 090, Japan, JP;(2) First Department of Surgery, Asahikawa Medical College, 4-5-3-11 Nishikagura, Asahikawa-shi, Hokkaido 078, Japan, JP
Abstract:
(Received for publication on Feb. 26, 1997; accepted on Nov. 6, 1997)