Affiliation: | Kyong Joo Lee, Kwang Joon Kim, Dong Ho Shin, Joo Won Chung, Jeong Youp Park, Seungmin Bang, Seung Woo Park, Division of Gastroenterology, Department of Internal Medicine, Yonsei Institute of Gastroenterology, Yonsei University College of Medicine, Seoul 120-752, South Korea. |