1. Department of Anthropology Northwestern University Evanston Illinois USA
2. Institute for Policy Research Northwestern University Evanston Illinois USA
3. Department of Epidemiology, Robert N. Butler Columbia Aging Center Columbia University Mailman School of Public Health New York City New York USA
4. Department of Nutrition Gillings School of Global Public Health, Carolina Population Center, CB #8120, University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
5. Office of Population Studies Foundation University of San Carlos Cebu City Philippines
6. Department of Medical Genetics, Faculty of Medicine University of British Columbia Vancouver British Columbia Canada
7. Edwin S.H. Leong Centre for Healthy Aging University of British Columbia Vancouver British Columbia Canada
8. University of British Columbia Centre for Molecular Medicine and Therapeutics Vancouver British Columbia Canada