1. Department of Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
2. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
3. Department of Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, College of Medicine, Dong-A University, Busan, Korea.
5. Department of Medicine, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
6. Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea.
7. Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.