1. Department of Preventive Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
2. Department of Pediatrics, Korea University College of Medicine, Seoul, Korea.
3. Department of Neurology, Korea University College of Medicine, Seoul, Korea.
4. Division of Infectious Diseases, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Respiratory and Critical Care Medicine, Inje University Seoul Paik Hospital, Seoul, Korea.
7. Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea.
8. Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, Korea.
9. Department of Urology, Kyung Hee University School of Medicine, Seoul, Korea.