Affiliation: | 1.Department of Surgery, Colorectal Division, Yonsei University College of Medicine, Seoul, 120-752, South Korea;2.Department of General Surgery, King Faisal University, Alahsa 31982, Saudi Arabia;3.Colorectal Surgery Unit, Department of General Surgery, Mansoura Faculty of Medicine, Mansoura University Hospital, Mansoura 35511, Egypt;4.Department of Pathology, Yonsei University College of Medicine, Seoul 120-752, South Korea. |