1. Department of Pediatrics, Inje University Ilsan Paik Hospital, Goyang, Korea.
2. Department of Preventive Medicine and Public Health, School of Medicine, Ajou University, Suwon, Korea.
3. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
4. Department of Rehabilitation Medicine, NHIC Ilsan Hospital, Goyang, Korea.
5. Department of Psychiatry, NHIC Ilsan Hospital, Goyang, Korea.
6. Department of Pediatrics, Kwandong University College of Medicine, Seoul, Korea.
7. Department of Pediatrics, Seoul Veterans Hospital, Seoul, Korea.
8. Department of Pediatrics, NHIC Ilsan Hospital, Goyang, Korea.