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