1. Department of Pediatrics, Kyungpook National University Medical Center, Kyungpook National University School of Medicine, Daegu, Korea.
2. Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Laboratory Medicine, Kyungpook National University Medical Center, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Pediatrics, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.