1. Department of Gastroenterology, Zhuji People's Hospital of Zhejiang Province, Zhuji, PR China.
2. Department of General Surgery, Tongde Hospital of Zhejiang Province, Hangzhou, PR China.
3. Department of Surgery, Hangzhou Hospital for the Prevention and Treatment of Occupational Disease, Hangzhou, PR China.
4. Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, PR China.
5. Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou, Zhejiang, PR China.