1. Social Policy Research Centre, University of New South Wales, Sydney, Australia
2. Centre for Primary Health Care and Equity, University of New South Wales, Sydney, Australia
3. Department of Optometry, Bindura University of Science Education, Bindura, Zimbabwe
4. School of Optometry & Vision Science, University of New South Wales, Sydney, Australia
5. Department of Geography and Planning, Queen’s University, Kingston, Canada
6. Department of Geography and Rural Development, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
7. Department of Sociology and Gerontology, Miami University, Oxford, USA