Published on in Vol 9, No 10 (2020): October
1 Department of Ophthalmology, College of Medicine, Enugu, Nigeria
2 Department of Clinical Research, London School of Hygiene & Tropical Medicine, London, United Kingdom
3 Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, United Kingdom
4 Department of Disease Control, London School of Hygiene & Tropical Medicine, London, United Kingdom
*all authors contributed equally