1. Department of Community Medicine, College of Health Sciences, University of Jos, Jos 930003, Nigeria
2. School of Health Sciences, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
3. The Children’s Hospital at Westmead, Locked Bag 4001, Westmead, NSW 2145, Australia
4. Translational Health Research Institute (THRI), Western Sydney University, Penrith, NSW 2571, Australia
5. Department of Public Health, Madda Walabu University Goba Referral Hospital, Bale-Goba 4540, Ethiopia
6. African Vision Research Institute, Westville Campus, University of KwaZulu-Natal, Durban 3629, South Africa