Jun Chul Chung1, Ok Pyung Song, Hyung Chul Kim. 1. Department of Surgery, Soonchunhyang University College of Medicine, Soonchunhyang University Bucheon Hospital, 1174 Jung-dong, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-767, South Korea. capcjc@hanmail.net