Funding for this research was provided by:
Danida Fellowship Centre (DFC File No. 14-P01-TAN)
International Foundation for Science (1-2-A-6100-1)
Received: 3 September 2019
Accepted: 14 October 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: Not applicable. The study involved retrospective surveillance data.
: Not applicable.
: The authors declare that they have no competing interests.