1. Department of Gastrointestinal Surgery, Shunde Hospital, Southern Medical University (The First People's Hospital of Shunde), The Second School of Clinical Medicine, Southern Medical University, Foshan, Guangdong 528308, P.R. China
2. Department of Anesthesiology and Operating Theatre, Shunde Hospital, Southern Medical University (The First People's Hospital of Shunde), The Second School of Clinical Medicine, Southern Medical University, Foshan, Guangdong 528308, P.R. China
3. Department of General Surgery, Zhujiang Hospital, Southern Medical University, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
4. Department of Gastrointestinal Surgery, Peking University Shougang Hospital, Beijing 100144, P.R. China
5. Department of Nephrology, Shunde Hospital, Southern Medical University (The First People's Hospital of Shunde), The Second School of Clinical Medicine, Southern Medical University, Foshan, Guangdong 528308, P.R. China