1. Department of Behavioral Medicine and Psychiatry, West Virginia University, Morgantown, WV, USA
2. Pacific Institute for Research and Evaluation, Calverton, MD, USA
3. Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Anthropology, University of California, Riverside, Riverside, CA, USA
5. Department of Epidemiology, West Virginia University, Morgantown, WV, USA