1. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea
2. Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul, Republic of Korea
3. Department of Rehabilitation Medicine, Eulji Medical Center, Eulji University School of Medicine, Seoul, Republic of Korea
4. Armed Force Cheongpyeong Hospital, Gyeonggi-do, Republic of Korea