1 Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No 100, Haining Rd, Shanghai, 200080, China.
2 Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, No 100, Haining Rd, Shanghai, 200080, China. xumingyi2014@163.com.