1. Department of Chemistry, University of Pretoria, Lynnwood Road,
Hatfield, Pretoria 0002, South Africa
2. Phytomedicine Programme, Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, Pretoria 0110, South Africa
3. Radiochemistry, South African Nuclear Energy Corporation (Necsa), Pelindaba, Brits R104, South Africa