1. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon 443-721, Korea.
2. Department of Internal Medicine, Kosin University College of Medicine, Busan 602-703, Korea.
3. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang 431-070, Korea.
4. Department of Internal Medicine, Korea University College of Medicine, Seoul 152-703, Korea.
5. Department of Pharmacology and Chronic Inflammatory, Disease Research Center, Ajou University School of Medicine, Suwon 443-721, Korea.