1 Department of Pediatrics, Hsinchu MacKay Memorial Hospital, Hsinchu, Taiwan.
2 Department of Pediatrics, MacKay Children's Hospital, Taipei, Taiwan; Department of Medicine, Mackay Medical College, Taipei, Taiwan; Mackay Junior College of Medicine, Nursing and Management, Taipei, Taiwan.
3 Department of Pediatrics, MacKay Children's Hospital, Taipei, Taiwan.
4 Department of Pediatrics, MacKay Children's Hospital, Taipei, Taiwan; Department of Medicine, Mackay Medical College, Taipei, Taiwan; Department of Pediatrics, Taipei Medical University Hospital, Taipei, Taiwan; Department of Pediatrics, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. Electronic address: tsaijd@yahoo.com.tw.