1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, CHA University School of Medicine, Seongnam, Korea.
3. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Pediatrics, Soonchunhyang University College of Medicine, Seoul, Korea.
5. Department of Pediatrics, College of Medicine, the Catholic University of Korea, Seoul, Korea.
6. Department of Pediatrics, Childhood Asthma Atopy Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
8. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
9. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
10. Department of Otorhinolaryngology-Head and Neck Surgery, Kyung Hee Medical Center, Seoul, Korea.
11. Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.