1. Division of Radiobiology, Department of Radiation Sciences, University of the Witwatersrand, Johannesburg, South Africa
2. Department of Radiation Oncology, Wits Donald Gordon Medical Centre, Johannesburg, South Africa
3. Department of Clinical and Radiation Oncology, Wits Donald Gordon Medical Centre, Johannesburg, South Africa
4. Department of Radiation Oncology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
5. Division of Nuclear Medicine, Department of Radiation Sciences, University of the Witwatersrand, Johannesburg, South Africa
6. Department of Nuclear Medicine, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
7. Division of Radiobiology, Department of Human Structure and Repair, Ghent University, Ghent, Belgium