1. Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, P.R.China
2. Shanghai Minimally Invasive Surgery Center, Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai 200025, P.R.China
3. Department of Colorectal Surgery, Second Hospital of Shandong University, Shandong University, Jinan 250000, P.R.China