Biodemography and Evolution Education and Health Sex and Gender Stieglitz, J., Blackwell, A.D., Quispe Gutierrez, R., Cortez Linares, E., Gurven, M., Kaplan, H. PLOS One, December 2012, Volume 7, Issue 12. 2012 gurven5.pdf http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0050384 Michael Gurven
