1. Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Republic of Korea.
2. Department of Psychiatry, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
3. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
4. Department of Psychiatry, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
5. Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
6. Department of Neurology, Konkuk University School of Medicine, Seoul, Republic of Korea.
7. Department of Neurology, Inha University School of Medicine, Incheon, Republic of Korea.
8. Department of Neurology, Seoul National University College of Medicine, Seoul, Republic of Korea.
9. Biostatistics Unit, Samsung Biomedical Research Institute, Seoul, Republic of Korea.