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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Olutoke O Ayorinde conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Gudlavalleti VS Murthy conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Oluwaseun O Akinyemi analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

London School of Hygiene & Tropical Medicine Research Ethics Committee (No: 011/415) and the University of Ibadan/University College Hospital Ethics Committee (NHREC05/01/2008a)

Funding

This work was supported by the Commonwealth Shared Scholarship Scheme/International Centre for Eye Health to OOA for which the lead author prosecuted the MSc, and the Public Health for Eye Care of the London School of Hygiene and Tropical Medicine (LSHTM). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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