1. Department of Neurology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
3. Department of Neurology, Cognitive Disorders and Dementia Center, Dong-A University College of Medicine and Institute of Convergence Bio-Health, Busan, Korea.
4. Department of Neurology, Gachon University Gil Hospital, Incheon, Korea.
5. Department of Neurology, Chung-Ang University Hospital, Seoul, Korea.
6. Department of Psychiatry, Inje University Sanggye Paik Hospital, Seoul, Korea.
7. Department of Psychiatry, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Neurology, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
9. Department of Neurology, Ewha Woman's University Mokdong Hospital, Ewha Woman's University School of Medicine, Seoul, Korea.
10. Department of Neurology, Inha University School of Medicine, Incheon, Korea.
11. Department of Neurology, Myongji Hospital, Goyang, Korea.
12. Department of Neurology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
13. Clinical Research Coordinating Center, Catholic Medical Center, College of Medicine, The Catholic University of Korea, Seoul, Korea.
14. Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.