Received: 23 August 2018
Accepted: 11 January 2019
First Online: 13 February 2019
Ethics approval and consent to participate
: University Human Ethics Research Committee granted ethical approval (Ethics approval ID number: CF12/3958 – 20120018910). Reciprocal ethical approval was obtained at all study sites. In accordance with ethics approval, informed written consent was obtained prior to participation.
: Not applicable.
: All authors declare that they have no competing interests.
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