?:authorAffiliation
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[\'Epidemiology and Surveillance Section, National Institute for Occupational Health, National Health Laboratory Service, Johannesburg 2000, South Africa.\', \'Faculty of Health Sciences, School of Public Health, University of Witwatersrand, Johannesburg 2000, South Africa.\', \'Department of Toxicology, National Institute for Occupational Health, National Health Laboratory Service, Johannesburg 2000, South Africa.\', \'Department of Environmental Health, Faculty of Health Sciences, University of Johannesburg, Johannesburg 2000, South Africa.\', \'Foundation for Professional Development, Pretoria, South Africa.\']
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