1. Department of Neurology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
2. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Neurology, Korea University Anam Hospital, Seoul, Korea.
4. Department of Psychiatry, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong, China.