1. Nuclear Medicine, University of Pretoria, Pretoria, South Africa
2. Biostatistics Unit, Pretoria MRC, South African Medical Research Council, Pretoria, South Africa
3. Urology, University of Pretoria, Pretoria, South Africa
4. Nuclear Medicine, Universiteit Gent Faculteit Geneeskunde en Gezondheidswetenschappen, Gent, Belgium
5. Department Nuclear Medicine, University Hospital Leuven, Kortrijk, Belgium