1. Environment and Health Research Unit, South African Medical Research Council, Pretoria, South Africa
2. Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria, South Africa
3. Centre for Environmental Health and Sustainability, University of Leicester, Leicester, United Kingdom
4. Institute for Environmental Futures, University of Leicester, Leicester, United Kingdom
5. Environment and Health Research Unit, South African Medical Research Council, Johannesburg, South Africa
6. Department of Environmental Health, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa