1. South African National Blood Service Roodepoort South Africa
2. Vitalant Research Institute San Francisco CA USA
3. University of California San Francisco San Francisco CA USA
4. Red Cross Children's Hospital Cape Town South Africa
5. Unité d'Epidémiologie et Physiopathologie des Virus Oncogènes Département de Virologie Institut Pasteur Paris France
6. CNRS, UMR3569 Paris France
7. South African Bone Marrow Registry Cape Town South Africa