1. Environment & Health Research Unit South African Medical Research Council Pretoria South Africa
2. Department of Geography, Meteorology and Geoinformatics University of Pretoria Pretoria South Africa
3. Department of Chemistry and Chemical Biology Cornell University Ithaca NY USA
4. Occupational Hygiene and Health Research Initiative North‐West University Potchefstroom South Africa
5. Cancer Society of New Zealand Social and Behavioural Research Unit Department of Preventive and Social Medicine Dunedin School of Medicine University of Otago Dunedin New Zealand