@article{Pettifor2004,
author = {Pettifor, A.E. and van der Straten, A. and Dunbar, M.S. and Shiboski, S.C. and Padian, N.S.},
title= {Early age of first sex: a risk factor for HIV infection among women in Zimbabwe},
year = {2004},
doi = {10.1097/01.aids.0000131338.61042.b8},
journal = {AIDS},
volume = {18},
number = {10},
pages = {1435--1442},
}