Prevalence and correlates of contraceptive use among adolescent mothers: Results from a cross-sectional survey in Ouagadougou, Burkina Faso, and Blantyre, Malawi - Emmanuel Oloche Otukpa; Alister Munthali; Nathalie Sawadogo; Boniface Ayanbekongshie Ushie; Anthony Idowu Ajayi (PLoS ONE)