Funding for this research was provided by:
Received: 15 November 2017
Accepted: 31 May 2018
First Online: 7 June 2018
Ethics approval and consent to participate
: Ethic approval of the protocol was granted by Comité Nacional de Bioética para Saúde (CNBS) of Mozambique (Ref. 260/ CNBS/15). No individual consent to participate was required as all the analyses were made on aggregated data.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.