1. Department of Endoscopic Diagnostics and Therapeutics, Kyushu University Hospital, Fukuoka, Japan.
2. Department of Medical Informatics, Kyushu University Hospital, Fukuoka, Japan.
3. Computing and Communications Center, Kyushu University, Fukuoka, Japan.
4. Department of Endoscopic Diagnostics and Therapeutics, Kyushu University Hospital, Fukuoka, Japan. Department of Surgery and Oncology, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan.