1 Department of Gastroenterology, Children's Hospital, Zhejiang University School of Medicine, Hangzhou, China; National Clinical Research Center for Child Health, Hangzhou, China.
2 National Clinical Research Center for Child Health, Hangzhou, China; Department of Pathology, Children's Hospital, Zhejiang University School of Medicine, Hangzhou, China.
3 Department of Gastroenterology, Children's Hospital, Zhejiang University School of Medicine, Hangzhou, China; National Clinical Research Center for Child Health, Hangzhou, China. Electronic address: 6185020@zju.edu.cn.