Article History
Received: 8 December 2017
Accepted: 2 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The current study was approved by the Research and Ethics committee of the Muhimbili University of Health and Allied Sciences. Data collection followed all ethical guidelines and written informed consent was obtained prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.