研究单位:[1]Department of Minimally Invasive Gastrointestinal Surgery, Peking University Cancer Hospital & Institute[2]Beijing Friendship Hospital[3]Beijing Shijitan Hospital, Capital Medical University[4]Xuanwu Hospital, Beijing[5]Beijing Tongren Hospital[6]Department of Minimally Invasive Gastrointestinal Surgery, Peking University Cancer Hospital & Institute,Beijing,China,100142