Affiliation: | (1) Department of Surgery, Osaka National Hospital, 2-1-4 Hoenzaka, Chuo-ku, Osaka 540, Japan Tel. +81-6-6942-1331; Fax +81-6-6943-6467 e-mail: tkoba@onh.go.jp, JP;(2) Department of Internal Medicine, Itami City Hospital, Itami, Japan, JP;(3) Second Department of Surgery, Osaka University Medical School, Osaka, Japan, JP |