1. IQM Consulting, Zuidhorn and University of Groningen Groningen The Netherlands
2. Division of Clinical Haematology, Department of Medicine, Groote Schuur Hospital University of Cape Town Cape Town South Africa
3. Division of Transfusion Medicine, Department of Laboratory Medicine University of California San Francisco California USA
4. Department of Haematology Sultan Qaboos University Hospital Muscat Oman
5. Versiti, Blood Center of Wisconsin Milwaukee Wisconsin USA
6. South African National Blood Service Roodepoort South Africa
7. Department of Pathology and Molecular Medicine, Kingston Health Sciences Centre Queen's University Kingston Ontario Canada
8. School of Clinical Medicine, Faculty of Health Sciences University of the Free State Bloemfontein South Africa
9. Department of Pathology, Microbiology and Immunology Vanderbilt University Medical Center Nashville Tennessee USA