1. Department of Neurology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
2. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
3. Department of Neurosurgery, University Hospital Dubrava, Zagreb, Croatia and Albert Einstein College of Medicine, New York, NY, USA.