1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.
3. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea.
6. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea.
7. Department of Dermatology, Dongguk University Ilsan Hospital, Goyang, Korea.
8. Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine, Seoul, Korea.
9. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.