1 Department of Neurology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, 93-6, Ji-dong, Paldal-gu, Suwon, Gyeonggi-do, 442-723, Republic of Korea.
2 Department of Orthopedic Surgery, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
3 Department of Neurology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, 93-6, Ji-dong, Paldal-gu, Suwon, Gyeonggi-do, 442-723, Republic of Korea. [email protected].