1 Department of Physical Medicine & Rehabilitation, Korea University Ansan Hospital, Korea University, College of Medicine, Seoul, Republic of Korea(∗).
2 Department of Physical Medicine & Rehabilitation, Korea University Ansan Hospital, Korea University, College of Medicine, Seoul, Republic of Korea(†).
3 Department of Physical Medicine & Rehabilitation, Korea University Ansan Hospital, Korea University, College of Medicine, Seoul, Republic of Korea(‡).
4 Department of Physical Medicine & Rehabilitation, Korea University Ansan Hospital, Korea University College of Medicine, 516 Gojan-dong, Danwon-gu, Ansan City, Gyeonggi Province, 425-707 Republic of Korea(§). Electronic address: rmkdh@korea.ac.kr.