1. Department of Nuclear Medicine, Sefako Makgatho Health Science University & Dr George Mukhari Academic Hospital, Pretoria 0208, South Africa
2. Department of Nuclear Medicine, Santa Maria Goretti Hospital, Via Canova 3, 04100 Latina, Italy
3. Department of Genetics, College of Health Sciences, University of KwaZulu Natal, Durban 4058, South Africa
4. Department of Nuclear Medicine, University of Pretoria & Steve Biko Academic Hospital, Pretoria 0001, South Africa