1. Department of Gastroenterology and Hepatology, The Second Affiliated Hospital, Harbin Medical University, Harbin, 150086, China
2. Department of Gastroenterology and Hepatology, The First People's Hospital of Yongkang, Zhejiang Province, 321300, China
3. Department of the Second Internal Medicine Ward, The Yellow River Hospital, Tianjin, 300101, China
4. Department of Gastroenterology and Hepatology, The Tailai County People's Hospital, Heilongjiang Province, 162400, China