1. Department of Anthropology, University of California Santa Barbara, CA 93106, USA.
2. Tsimane Health and Life History Project, San Borja, Bolivia.
3. Broom Center for Demography, University of California Santa Barbara, CA 93106, USA.
4. Department of Anthropology, University of Missouri, Columbia, MO 65211, USA.
5. Department of Anthropology, University of New Mexico, Albuquerque, NM 87131, USA.
6. Center for Evolutionary Medicine, Arizona State University, Tempe, AZ 85287, USA.
7. School of Human Evolution and Social Change, Arizona State University, Tempe, AZ, USA.
8. Institute for Advanced Study in Toulouse, Toulouse, France.
9. Department of Anthropology, Emory University, Atlanta, GA 30322, USA.