1. Department of Physical Medicine and Rehabilitation, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon 630-522, Korea.
2. Department of Nephrology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon 630-522, Korea.
3. Department of Neuropsychiatry, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon 630-522, Korea.
4. Department of Physical Medicine and Rehabilitation, Haeundae Paik Hospital, Inje University School of Medicine, Busan 612-862, Korea.