About the Authors

Nisha Naicker

Contributed equally to this work with: Nisha Naicker, Pieter de Jager, Shan Naidoo, Angela Mathee

nisha.naicker@mrc.ac.za

Affiliations Environment & Health Research Unit, South African Medical Research Council, Johannesburg, South Africa, Department of Community Medicine, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa

Pieter de Jager

Contributed equally to this work with: Nisha Naicker, Pieter de Jager, Shan Naidoo, Angela Mathee

Affiliations Department of Community Medicine, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa, Epidemiology and Surveillance Unit, National Institute for Occupational Health, National Health Laboratory Service, Johannesburg, South Africa

Shan Naidoo

Contributed equally to this work with: Nisha Naicker, Pieter de Jager, Shan Naidoo, Angela Mathee

Affiliation Department of Community Medicine, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa

Angela Mathee

Contributed equally to this work with: Nisha Naicker, Pieter de Jager, Shan Naidoo, Angela Mathee

Affiliations Environment & Health Research Unit, South African Medical Research Council, Johannesburg, South Africa, Department of Community Medicine, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa, Faculty of Health Sciences, University of Johannesburg, Johannesburg, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NN AM SN. Performed the experiments: NN PDJ. Analyzed the data: NN PDJ AM. Wrote the paper: NN PDJ AM SN.