1 Division of Pediatric Gastroenterology, Department of Pediatrics, Taipei Medical University Hospital, Taipei City, Taiwan; School of Medicine, Taipei Medical University, Taipei City, Taiwan.
2 Division of Pediatric Surgery, Department of Surgery, Taipei Medical University Hospital, Taipei City, Taiwan; Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu City, Taiwan.