1. School of Clinical Medicine, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
2. Faculty of Podiatric Medicine, Royal College of Physicians and Surgeons, Glasgow, Scotland
3. Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
4. School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa