Received: 19 July 2016
Accepted: 21 February 2018
First Online: 2 March 2018
Ethics approval and consent to participate
: We obtained ethical clearance in writing from the National Health Research Authority of Zambia. Other than that, written informed consent was sort from the participants before participation and they were informed of their right to discontinue their participation at any point should they wish to.
: Not applicable.
: Milena Pavlova is a Section Editor for BMC Health Services Research. The other authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.