1. Department of Endoscopic Diagnostics and Therapeutics; Kyushu University Hospital; 3-1-1 Maidashi, Higashi-ku Fukuoka 812-8582 Japan
2. Department of Surgery and Oncology; Kyushu University Graduate School of Medical Sciences; Fukuoka Japan
3. Department of Medical Informatics; Kyushu University Hospital; Fukuoka Japan
4. Research Institute for Information Technology; Kyushu University; Fukuoka Japan
5. Department of Medicine; Chulalongkorn University Hospital; Bangkok Thailand
6. Department of Surgery; Siriraj Hospital, Mahidol University; Bangkok Thailand
7. Endoscopic Center, Peking Union Medical College Hospital; Chinese Academy of Medical Sciences; Beijing China