Received: 21 October 2020
Accepted: 16 December 2020
First Online: 7 January 2021
Change Date: 11 February 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s13027-021-00348-5
: Ethical approval for this study was obtained from the Parirenyatwa-University of Zimbabwe Joint Research Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.