1. From the Division of Anatomical Pathology, University of Cape Town, Cape Town, and the National Health Laboratory Service, Western Cape, South Africa (Drs Aldera and Pillay); the Department of Anatomical Pathology, Groote Schuur Hospital, Western Cape, South Africa (Dr Aldera); and the Department of Anatomical Pathology, Red Cross War Memorial Children's Hospital, Cape Town, South Africa (Dr Pill