Katsuhito Suwa1, Tomoyoshi Okamoto2, Katsuhiko Yanaga3. 1. Department of Surgery, Daisan Hospital, The Jikei University School of Medicine, 4-11-1 Izumihoncho, Komae-shi, Tokyo, 201-8601, Japan. katsuhitosuwa0124@gmail.com. 2. Department of Surgery, Daisan Hospital, The Jikei University School of Medicine, 4-11-1 Izumihoncho, Komae-shi, Tokyo, 201-8601, Japan. 3. Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan.