1. Department of Internal Medicine, Seoul National University Medical Research Center, Seoul National University College of Medicine, Seoul, Korea.
2. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Kyungpook National University College of Medicine, Daegu, Korea.
4. Regional Pharmacovigilance Center, Seoul National University Hospital, Seoul, Korea.