1. Department of Pediatrics, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Catholic Genetic Laboratory Center, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea.
5. Rare Disease Center, Seoul National University Hospital, Seoul, Korea.