^○Chie Takishita, Yuichi Nagakawa, Yatsuka Sahara, Tomoki Shirota, Yosuke Hijikata, Yuichi Hosokawa, Tetsushi Nakajima, Nao Kobayashi, Hiroaki Osakabe, Kenji Katsumata, Akihiko Tsuchida (Department of Gastrointestinal and Pediatric Surgery, Tokyo Medical University)

^○Hyungjoon Han, Tae-Jin Song (Department of Surgery, Korea University)

^○Hanlim Choi^1,2, Jae-Woon Choi^1,2, Dong Hee Ryu^1,2, Yanjie Xu² (1.Department of Surgery, Chungbuk National University Hospital, 2.Department of Surgery, Chungbuk National University College of Medicine)

^○Hae Il Jung, Soon Ha Kwon, Sang Ho Bae (Division of Hepatobiliary Surgery, Department of General Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea)

^○Keishi Sugimachi, Tomohiro Iguchi (Department of Hepatobiliary-Pancreatic Surgery, National Kyushu Cancer Center, Fukuoka, Japan)

^○Yasuhisa Tango, Hisanori Shiomi (Department of Surgery, Nagahama Redcross Hospital)