1. Department of Neurology, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea
2. Research Center for Tooth and Periodontal Regeneration, Kyung Hee University School of Dentistry, Seoul, Korea
3. Medical Research Institute, Chung-Ang University College of Medicine, Seoul, Korea
4. Division of Neurology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
5. Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Korea