1Department of Pediatrics, Xinqiao Hospital, Third Military Medical University (Army Medical University), Chongqing 400037, PR China
2Department of Hematology, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, PR China
3Department of Pediatrics, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing 400038, PR China
4Department of Gastroenterology, Xinqiao Hospital, Third Military Medical University (Army Medical University), Chongqing 400037, PR China