TY - JOUR A1 - Pettifor, A.E. A1 - van der Straten, A. A1 - Dunbar, M.S. A1 - Shiboski, S.C. A1 - Padian, N.S. T1 - Early age of first sex: a risk factor for HIV infection among women in Zimbabwe Y1 - 2004 DO - 10.1097/01.aids.0000131338.61042.b8 JF - AIDS VL - 18 IS - 10 SP - 1435 EP - -1442 ER -