T-J John1, I Abdullah2, K John. 1. Division of Cardiology, Department of Medicine, Stellenbosch University and Tygerberg Academic Hospital, P.O. Box 241, Cape Town 8000, South Africa. 2. Division of Haematopathology, Department of Pathology, Stellenbosch University and Tygerberg Academic Hospital, P.O. Box 241, Cape Town 8000, South Africa.