Chun-Chen Lin1, Hsin Chi2, Jeng-Daw Tsai3. 1. Department of Pediatrics, Mackay Memorial Hospital, Taipei, Taiwan; Department of Medicine, Mackay Medical College, Taipei, Taiwan; Mackay Junior College of Medicine, Nursing and Management, Taipei, Taiwan. 2. Department of Pediatrics, Mackay Children's Hospital, Taipei, Taiwan. 3. Department of Medicine, Mackay Medical College, Taipei, Taiwan; Department of Pediatrics, Mackay Children's Hospital, Taipei, Taiwan; Department of Pediatrics, Taipei Medical University, Taipei, Taiwan.