Received: 9 October 2017
Accepted: 5 January 2018
First Online: 15 January 2018
Ethics approval and consent to participate
: The research was conducted in accordance with guidelines established by the Declaration of Helsinki. Consent for participation in the surveys was obtained by the Colombian Institute of Family Welfare prior to enrollment (Instituto Colombiano de Bienestar Familiar–ICBF). The ethics committee in health research at the Industrial University of Santander determined that the analyses of these de-identified data were exempt from review.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.