1 Department of Gastroenterology, Northern Jiangsu People's Hospital, Clinical Medical College of Yangzhou University, Yangzhou, P.R. China; Department of Internal Medicine, Health Service Center of Touqiao, Yangzhou, P.R. China.
2 Department of Pathology, Northern Jiangsu People's Hospital, Clinical Medical College of Yangzhou University, Yangzhou, P.R. China.
3 Department of Gastroenterology, Northern Jiangsu People's Hospital, Clinical Medical College of Yangzhou University, Yangzhou, P.R. China.