1. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
4. Department of Regulatory Affairs & Market Access, Sanofi-Aventis Korea Co. Ltd., Seoul, Korea.
5. Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, Korea.