Tokyo Medical and Dental University (JP), Fujita Health University (JP), Ashikaga Red Cross Hospital (JP), Seirei Mikatabara General Hospital (JP), Hamamatsu University Hospital (JP), The Japanese Society of Gastroenterological Surgery (JP), Fujita Health University Hospital (JP), Haradoi Hospital (JP), Ichikawa City Rehabilitation Hospital (JP), Wakaba Hospital (JP), Fujita Health University Nanakuri Memorial Hospital, Musashi University (JP)