1. Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul, Korea
2. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea
3. Department of Pathology, Seoul National University Hospital, Seoul, Korea
4. Department of Pathology, Seoul National University College of Medicine, Seoul, Korea
5. Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea
6. Institute on Aging, Seoul National University, Seoul, Korea