1. Department of Gastrointestinal Surgery, The Second Affiliated Hospital of Wannan Medical College, Wuhu, China.
2. Department of Hepatobiliary Surgery, The Second People's Hospital of Wuhu, Wuhu, China.
3. Department of Gastroenterology, The Second Affiliated Hospital of Wannan Medical College, Wuhu, China.
4. Department of Gastroenterology, Lianshui County People's Hospital, Huai'an, China.