1. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
2. Department of Pediatrics, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Eulji University School of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Allergy and Clinical Immunology, University of Ulsan College of Medicine, Seoul, Korea.
7. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
8. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
9. Department of Pediatrics, University of Ulsan College of Medicine, Seoul, Korea.
10. Department of Pediatrics, The Catholic University of Korea College of Medicine, Seoul, Korea.
11. Department of Pediatrics, CHA University School of Medicine, Pocheon, Korea.
12. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
13. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.