Affiliation: | 1. Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, South Korea;2. Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, South Korea;3. College of Pharmacy, Sahmyook University, Hwarangro 815, Nowon-gu, Seoul 139-742, South Korea;4. Department of Medicine, Howard University, Washington, DC 20060, USA |