1. Division of Radiobiology, Faculty of Medicine and Health Sciences, Department of Medical Imaging and Clinical Oncology, Stellenbosch University, Tygerberg 7505, South Africa
2. Faculty of Medicine and Health Sciences, Department of Urology, University of Stellenbosch, Tygerberg, South Africa
3. Applied Radiation Biology Centre, Radiological and Medical Sciences Research Institute, Ghana Atomic Energy Commission, Accra, Ghana