1. Department of Gastroenterology and Hepatology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
2. Department of Gastroenterology and Hepatology, Shandong Provincial Hospital, Shandong University, Jinan, China
3. Department of Gastroenterology, The Affiliated Hospital of Zunyi Medical College, Zunyi, Guizhou, China
4. Department of Gastroenterology, Beijing Ditan Hospital, Capital Medical University, Beijing, China
5. Department of Gastroenterology, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Anhui, China
6. Department of Gastroenterology, Liaocheng People’s Hospital, Liaocheng, China