1. Department of Gastroenterology, The Affiliated Changzhou No. 2 People's Hospital of Nanjing Medical University, Changzhou, Jiangsu 213003, P.R. China
2. Department of Clinical Laboratory, Qingdao Women and Children's Hospital, Qingdao, Shandong 266034, P.R. China
3. Department of Gastroenterology, The Affiliated Changzhou No.2 People's Hospital of Nanjing Medical University, Changzhou, Jiangsu 213003, P.R. China
4. Department of Internal Medicine, Graduate School of Dalian Medical University, Dalian, Liaoning 116044, P.R. China
5. Department of Gastroenterology, Shanghai Tenth People's Hospital, Clinical Medical College of Nanjing Medical University, Shanghai 200072, P.R. China