1. Department of Gastroenterology, The First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
2. Department of Gastroenterology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
3. Department of Nuclear Medicine, Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, China
4. Department of Gastroenterology, Lianshui County People’s Hospital, Huaian, Jiangsu 210004, China
5. Department of Gastroenterology, Lianshui People’s Hospital of Kangda College Affiliated to Nanjing Medical University, Huaian, Jiangsu 210004, China