1. Department of Gastroenterological and Pediatric Surgery; Oita University Faculty of Medicine; Oita Japan
2. Center for Community Medicine; Oita University Faculty of Medicine; Oita Japan
3. Department of Surgery; Tenshindo Hetsugi Hospital; Oita Japan
4. Department of Research and Development Section; Kaigen Pharma Co., Ltd; Osaka Japan
5. Oita University; Oita Japan