1. The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
2. The First Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
3. Department of Gastrointestinal and Pancreatic Surgery, Zhejiang Provincial People's Hospital, Hangzhou, Zhejiang, China
4. Key Laboratory of Gastroenterology of Zhejiang Province, Hangzhou, Zhejiang, China