1 Medical College of Yangzhou University, Yangzhou, Jiangsu Province, PR China.
2 Department of Gastroenterology, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, Jiangsu Province, PR China.
3 Department of Gastroenterology, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, Jiangsu Province, PR China; Department of Internal Medicine, Community Healthcare Center of Hangji, No. 1, Sanxing Road, Hangji Town, Yangzhou Biodiverse and Sci-Tech City, Jiangsu Province, PR China. Electronic address: alenzhu_1982@163.com.