1. Department of Anthropology, University of Oregon, Eugene, Oregon, USA
2. World Health Organization Study on Global Ageing and Adult Health (SAGE), Geneva, Switzerland
3. University of Newcastle Research Centre for Generational Health and Ageing, New Lambton Heights, Australia
4. Department of Anthropology, Northwestern University, Evanston, Illinois, USA
5. Department of Biology, Vassar College, Poughkeepsie, New York, USA