About the Authors

Nigel J. Crowther

nigel.crowther@nhls.ac.za

Affiliation Department of Chemical Pathology, National Health Laboratory Service, University of the Witwatersrand Faculty of Health Sciences, Johannesburg, South Africa

Shane A. Norris

Affiliation MRC/University of the Witwatersrand Developmental Pathways for Health Research Unit, Department of Paediatrics, University of the Witwatersrand Faculty of Health Sciences, Johannesburg, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SAN. Performed the experiments: SAN. Analyzed the data: NJC. Contributed reagents/materials/analysis tools: SAN. Wrote the paper: NJC.