Kiyokazu Nakajima 1, 9, Shusaku Tsutsui 2, 9, Toshirou Nishida 3, 9, Kazuhiro Yasuda 4, 9, Kazuki Sumiyama 5, 9, Naohisa Yahagi 6, 9, Yoshihisa Saida 7, 9, Hitoshi Kondo 8, 9, Yuichiro Doki 1, 9
1 Department of Surgery, Osaka University, Osaka, Japan
2 Department of Gastroenterology and Hepatology, Osaka University, Osaka, Japan
3 Department of Surgery, Osaka Police Hospital, Osaka, Japan
4 Department of Surgery, Oita University, Oita, Japan
5 Department of Endoscopy, The Jikei University, Tokyo, Japan
6 Division of Research and Development for Minimally Invasive Treatment, Keio University, Tokyo, Japan
7 Department of Surgery, Toho University Ohashi Medical Center, Tokyo, Japan
8 The Center for Digestive Diseases, Tonan Hospital, Sapporo, Japan
9 Japan SPACE Study Group, Osaka, Japan