1. Department of Radiochemistry, The South African Nuclear Energy Corporation SOC Ltd. (Necsa), Brits 0240, South Africa
2. Department of Nuclear Medicine, Faculty of Health Sciences, University of Pretoria, Private Bag X323, Gezina 0031, South Africa
3. Department of Physiology, Faculty of Health Sciences, University of Pretoria, Private Bag X323, Gezina 0031, South Africa
4. Centre for Neuroendocrinology, Department of Immunology, Faculty of Health Sciences, University of Pretoria, Private Bag X323, Gezina 0031, South Africa
5. Nuclear Medicine Research Infrastructure NPC, Level 5 Bridge A, Capital Park, Pretoria 0001, South Africa
6. Steve Biko Academic Hospital, Private Bag X169, Pretoria 0001, South Africa
7. Deanery of Biomedical Sciences, University of Edinburgh, Edinburgh EH8 9XD, UK