1. Department of Ophthalmology, Federal Medical Centre Owerri, Nigeria
2. International Centre for Eye Health (ICH), London School of Hygiene and Tropical Medicine (LSHTM)
3. Department of Ophthalmology, University of Nigeria Teaching Hospital Ituku-Ozala, Nigeria
4. Department of Ophthalmology, Alex Ekwueme University Teaching Hospital Abakiliki, Nigeria
5. Department of Medical Statistics, Faculty of Life Sciences and Medicine King’s College, London, United Kingdom