1. Department of Mechanical Engineering, University of Cape Town, Cape Town, South Africa
2. Stellenbosch Institute for Advanced Study, Wallenberg Research Centre, Stellenbosch University, Stellenbosch, South Africa
3. Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa
4. Department of Mechanical Engineering, University of South Africa, Johannesburg, South Africa
5. Department of Mechanical Engineering, University College London, London, United Kingdom
6. School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, Johannesburg, South Africa