Received: 18 March 2019
Accepted: 26 June 2019
First Online: 1 July 2019
Ethics approval and consent to participate
: Since the study was a retrospective review and used archival medical records, informed consent was not obtained. All data was de-identified and was available to the co-authors only. The study received ethical approval from National Health Sciences Research and Ethics Committee in Malawi protocol number 1216.
: Not applicable.
: The authors declare that they have no competing interests.