Received: 6 September 2018
Accepted: 27 February 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: Ethical approval for this study was sought and obtained from the Research Ethics Committee at Mbarara University of Science and Technology.
: Consent to publish has been got for the Ministry of Health of Uganda from the Uganda National Expanded programme for Innunization programme manager.
: The authors declare that there are no competing interests.