1. Department of Physical Medicine and Rehabilitation, Korea University Guro Hospital, Korea University College of Medicine, Guro-gu, Seoul, Korea
2. Department of Physical Medicine and Rehabilitation, Sahmyook Medical Center, Dongdaemun-gu, Seoul, Korea
3. Department of Biostatistics, Korea University College of Medicine, KoreaSeongbuk-gu, Seoul, Korea
4. Department Computer Science and Engineering, Korea University, Seongbuk-gu, Seoul, Korea.