1. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea
3. Department of Neurology, Ewha Womans University Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea
4. Department of Neurology, Gachon University Gil Medical Center, Incheon, Korea
5. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea5Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
6. Department of Neurology, Inha University School of Medicine, Incheon, Korea
7. Department of Biomedical Engineering, Hanyang University, Seoul, Korea
8. Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
10. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
11. Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
12. Institute for Stroke and Dementia Research, Ludwig-Maximilians University, Munich, Germany
13. Department of Brain Repair and Rehabilitation, University College London Institute of Neurology, Queen Square, London, England
14. Department of Radiology, University of California, San Francisco15Center for Imaging of Neurodegenerative Diseases, Department of Veterans Affairs Medical Center, San Francisco, California