1. Division of GI and Hepatology, The Research Institute of Clinical Medicine, Department of Internal Medicine, Chonbuk National University Medical School and Hospital, Jeonju 561-712, Korea.
2. Department of Biology and Biomedical Science, Dong-A University, Busan 604-714, Korea.
3. Korean Bioinformation Center, KRIBB, Daejeon 305-806, Korea.