TY - JOUR A1 - Alvergne, A. A1 - Gibson, M.A. A1 - Gurmu, E. A1 - Mace, R. T1 - Social transmission and the spread of modern contraception in rural Ethiopia Y1 - 2011 DO - 10.1371/journal.pone.0022515 VL - 6 IS - 7 ER -