1. Department of Gastroenterology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China
2. Department of Gastroenterology, Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China
3. Department of Hematology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu 221000, P.R. China