1. Department of Gastroenterology, Changhai Hospital, Naval Military Medical University , Shanghai, P. R. China
2. Department of Emergency, Changhai Hospital, Naval Military Medical University , Shanghai, P. R. China
3. Department of Nephrology, Gongli Hospital, Pudong New Area , Shanghai, P. R. China
4. Department of Radiology, Changzheng Hospital, Naval Military Medical University , Shanghai, P. R. China
5. Department of Gastroenterology, Changzheng Hospital, Naval Military Medical University , Shanghai, P. R. China