1. Department of Dermatology, Kangwon National University School of Medicine, Chuncheon, Korea.
2. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
3. Department of Family Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
4. Division of Allergy and Clinical Immunology, Kangwon National University School of Medicine, Chuncheon, Korea.