1. Department of Psychology and Neuroscience, Duke University , Durham, 27708 NC, USA
2. Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London , SE5 8AF London, UK
3. Center for the Study of Population Health and Aging, Duke University Population Research Institute , Durham, 27708 NC, USA
4. Geriatric Research, Education, and Clinical Center, VA Durham Healthcare System , Durham, 27708 NC, USA
5. Department of Psychology and Dunedin Multidisciplinary Health and Development Research Unit, University of Otago , 9016 Dunedin, New Zealand
6. Consumer Innovation Consortium, Department of Business Management, North Carolina State University , Raleigh, 27695 NC, USA