1. Department of Dermatology, Pusan National University School of Medicine, Yangsan, Korea.
2. Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
3. Department of Dermatology, School of Medicine, University of California Davis, Sacramento, CA, USA.
4. Division of Rheumatology and Immunology, Veterans Affairs Medical Center Sacramento, Sacramento, CA, USA.
5. Division of Rheumatology, Allergy and Clinical Immunology, Department of Internal Medicine, School of Medicine, University of California Davis, Sacramento, CA, USA.