1 Department of Gastroenterology, Clinical Medical College, Yangzhou University/Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, China; Department of Internal Medicine, Health Service Center of Touqiao, Yangzhou, China.
2 Department of Gastroenterology, Clinical Medical College, Yangzhou University/Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, China.