1. Department of Paediatrics, Grey’s Hospital, Pietermaritzburg, South Africa
2. Department of Paediatrics, Nelson R Mandela School of Medicine, University of KwaZulu Natal, Durban, South Africa
3. School of Mathematics, Statistics and Computer Science, University of KwaZulu Natal, Durban, South Africa
4. Department of Paediatric Haemato-Oncology, Antwerp University Hospital, University of Antwerp, Belgium