Oh Jeong1, Young Kyu Park2, Mi Ran Jung2, Seong Yeob Ryu2. 1. Division of Gastroenterological Surgery, Department of Surgery, Chonnam National University College of Medicine, Ilsim-ri 160, Hwasun-eup, Hwasun-gun, Jeollanam-do, 519-809, Republic of Korea. surgeonjeong@gmail.com. 2. Division of Gastroenterological Surgery, Department of Surgery, Chonnam National University College of Medicine, Ilsim-ri 160, Hwasun-eup, Hwasun-gun, Jeollanam-do, 519-809, Republic of Korea.