Department of Neurology Ulsan University Hospital University of Ulsan College of Medicine Ulsan 44033 Korea;
Department of Physical Medicine and Rehabilitation Ulsan University Hospital University of Ulsan College of Medicine Ulsan 44033 Korea;
Department of Neurology Keimyung University School of Medicine Daegu 42601 Korea;
Department of Neurology College of Medicine Soonchunhyang University Soonchunhyang University Bucheon Hospital Bucheon 14584 Korea;