1. Department of Neurology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
2. Department of Parasitology and Tropical Medicine, Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Neurology, Ewha Womans University Medical Center, Seoul, Korea.
4. Department of Neurology and Movement Disorder Center, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.