[1] Univ Witwatersrand, Fac Hlth Sci, SAMRC Wits Dev Pathways Hlth Res Unit, Johannesburg, South Africa
[2] Museum Natl Hist Nat, Musee Homme, CNRS, UMR Ecoanthropol 7206, Paris, France
[3] Univ Witwatersrand, Fac Hlth Sci, Dept Paediat & Child Hlth, Div Community Paediat, Johannesburg, South Africa
[4] Univ Witwatersrand, Fac Hlth Sci, Dept Paediat, SAMRC Wits Dev Pathways Hlth Res Unit, 7 York Rd,Parktown, ZA-2193 Johannesburg, South Africa