1. Geriatric Research, Education, and Clinical Center (GRECC), Malcom Randall VA Medical Center, Gainesville, FL, USA
2. Division of Behavioral Neurology and Neuropsychiatry, Department of Neurology, University of Florida, Gainesville, FL, USA
3. Neurology Unit, Synphaet Hospital, Bangkok, Thailand
4. Department of Neurology, Prasat Neurological Institute, Bangkok, Thailand