1. Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea.
2. Department of Laboratory Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
3. Seegene Medical Foundation, Seoul, Korea.
4. Department of Internal Medicine, Seoul National University College of Medicine, National University Hospital, Seoul, Korea.
5. Research Institute, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
6. Department of Pediatrics, Chosun University Hospital, Gwangju, Korea.
7. Department of Laboratory Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.