TY - JOUR A1 - Magnusson, B.M. A1 - Masho, S.W. A1 - Lapane, K.L. T1 - Early age at first intercourse and subsequent gaps in contraceptive use Y1 - 2012 DO - 10.1089/jwh.2011.2893 VL - 21 IS - 1 ER -