1. Alabama Research Institute on Aging, The University of Alabama, Tuscaloosa, AL, USA
2. Department of Anthropology, The University of Alabama, Tuscaloosa, AL, USA
3. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, USA
4. Program in Public Health, Department of Family, Population, and Preventive Medicine, Stony Brook University, Stony Brook, NY, USA