Department of Gastroenterology, Beijing Children′s Hospital, Capital Medical University, National Center for Children′s Health, Beijing 100045, China;
Department of Gastroenterology, Beijing Children′s Hospital, Capital Medical University, National Center for Children′s Health, Beijing 100045, China;
Department of Gastroenterology, Beijing Children′s Hospital, Capital Medical University, National Center for Children′s Health, Beijing 100045, China;
Department of Gastroenterology, Beijing Children′s Hospital, Capital Medical University, National Center for Children′s Health, Beijing 100045, China;
Department of Gastroenterology, Beijing Children′s Hospital, Capital Medical University, National Center for Children′s Health, Beijing 100045, China;