Hamamatsu University School of Medicine (JP), Konan Kosei Hospital (JP), Kurume University Hospital (JP), Osaka City General Hospital (JP), The Japanese Society of Gastroenterological Surgery (JP), The Jikei University Hospital (JP), Social Insurance Saitama Chuo Hospital (JP), Nagasaki University Hospital (JP), Takushoku University (JP), Dokkyo Medical University (JP), International University of Health and Welfare (JP)