Contraception use and pregnancy among 15–24 year old South African women: a nationally representative cross-sectional surveyCatherine MacPhail, Helen Rees, Audrey Pettifor et al.|BMC Medicine|2007Cited by 116
Heterosexual anal intercourse increases risk of HIV infection among young South African menTim Lane, Helen Rees, Audrey Pettifor et al.|AIDS|2005Cited by 80
Predictors of dual method use for pregnancy and HIV prevention among adolescent South African womenCatherine MacPhail, Helen Rees, Audrey Pettifor et al.|Contraception|2007Cited by 44
Do behavioural differences help to explain variations in HIV prevalence in adolescents in sub-Saharan Africa?R. Chapman, Richard Hayes, A. Buvé et al.|Tropical Medicine & International Health|2010Cited by 40