1. National Institute of Dementia, Seongnam, South Korea
2. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, South Korea
3. School of Nursing, University of Minnesota Twin Cities, Minneapolis, MN, USA
4. Department of Psychiatry, Seoul National University College of Medicine, Seoul, South Korea
5. Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, South Korea