1. TheDepartment of Haematology and the Bone Marrow Transplantation Unit, Constantiaberg Medi-Clinic, Burnham Road, Plumstead 7800, Cape Town, South Africa
2. The Department of Haematological Pathology, University of Stellenbosch and Tygerberg Academic Hospital, Private Bag X3, Tygerberg 7505, Cape, South Africa