1. Department of Psychiatry, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, South Korea
2. Institute for Skeletal Aging, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, South Korea
3. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, South Korea
4. Institute on Aging, Ajou University Medical Center, Suwon, South Korea
5. Department of Neurology, Inha University School of Medicine, Incheon, South Korea
6. Department of Neurology, Ajou University School of Medicine, South Korea
7. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
8. Neuroscience Center, Samsung Medical Center, Seoul, South Korea
9. Department of Clinical Research Design and Evaluation, SAIHST, Sungkyunkwan University, Seoul, South Korea
10. Department of Neurology, Dong-A University College of Medicine, Pusan, South Korea
11. Department of Neurology, Catholic Kwandong University College of Medicine, Gangneung, South Korea
12. Department of Neurology, Myongji Hospital, Goyang, South Korea
13. Department of Neurology, Gachon University Gil Medical Center, Incheon, South Korea
14. Department of Neurology, Konkuk University College of Medicine, Seoul, South Korea
15. Department of Neurology, Pusan National University School of Medicine, Pusan, South Korea
16. Department of Neurology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea
17. Department of Neurology, Soonchunhyang University Bucheon Hospital, College of Medicine, Bucheon, South Korea
18. Department of Neurology, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, South Korea
19. Department of Neurology, Ilsan Hospital, National Health Insurance Service, Goyang, South Korea
20. Department of Psychiatry, Ajou University School of Medicine, Suwon, South Korea
21. Department of Neurology, Yonsei University College of Medicine, Seoul, South Korea