Received: 28 May 2019
Accepted: 7 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Medical Research Council of Zimbabwe (Ref. A/2226). Additional approvals were obtained from the Ministry of Education and the participating schools. Written Informed consent was obtained from all the adolescents and their parents.
: Not applicable.
: The authors report no competing interests.