Marin Arias, L., Ureña Cascante, M.E. and Fernández Rojas, X. 2017. Duration of exclusive breastfeeding in an urban and rural community in Costa Rica. Población y Salud en Mesoamérica. 15, 2 (Dec. 2017). DOI:https://doi.org/10.15517/psm.v15i2.26408.