1 Department of Gastroenterology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
2 Department of Pathology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
3 Department of Gastroenterology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China. Electronic address: jshmao@zju.edu.cn.