1. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
2. Department of Pediatrics, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
3. Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea.
4. Maeil Central Research Laboratory, Pyeongtaek, Korea.
5. Suwon Center for Environmental Disease and Atopy, Suwon, Korea.
6. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Pediatrics, Soonchunhyang University College of Medicine, Cheonan, Korea.
8. Department of Pediatrics, Sungkyunkwan University School of Medicine, Seoul, Korea.
9. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
10. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
11. Department of Pediatrics, Eulji University School of Medicine, Daejeon, Korea.
12. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea.
13. Department of Pediatrics, Ajou University School of Medicine, Suwon, Korea.