About the Authors

Alfred Musekiwa

Alfred.Musekiwa@gmail.com

Affiliations School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Pietermaritzburg, South Africa, Wits Reproductive Health & HIV Institute (WRHI), Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa

Evans Muchiri

Affiliation Wits Reproductive Health & HIV Institute (WRHI), Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa

Samuel O. M. Manda

Affiliations School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Pietermaritzburg, South Africa, Biostatistics Unit, South African Medical Research Council, Pretoria, South Africa

Henry G. Mwambi

Affiliation School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Pietermaritzburg, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AM. Analyzed the data: AM. Wrote the manuscript: AM EM SM HM. Conceived the topic: AM. Searched for studies: AM. Selected studies: AM EM. Extracted data: AM EM. Interpretation: AM EM SM HM. Critical appraisal: AM EM SM HM.