1. Department of Gastroenterology and Hepatology; General Hospital, Tianjin Medical University; Tianjin People's Republic of China
2. Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics; Vanderbilt University Medical Center; Nashville TN
3. Department of Gastroenterology; Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University; Hangzhou People's Republic of China
4. Department of Pathology; General Hospital, Tianjin Medical University; Tianjin People's Republic of China
5. Department of Gastroenterology and Hepatology; Tianjin Haibin People's Hospital; Tianjin People's Republic of China