Taizo Hibi1, Susumu Eguchi2, Hiroto Egawa3. 1. Department of Pediatric Surgery and Transplantation, Kumamoto University Graduate School of Medical Sciences, Kumamoto, Japan. 2. Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. 3. Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan.