1. Division of Medical Virology University of Cape Town Cape Town Western Cape South Africa
2. National Health Laboratory Service, Groote Schuur Hospital Cape Town Western Cape South Africa
3. Department of Medicine, Division of Neurology University of Cape Town Cape Town Western Cape South Africa
4. Department of Neurology Hawke's Bay Fallen Soldiers Memorial Hospital Hastings New Zealand
5. Division of Chemical Pathology University of Cape Town Cape Town Western Cape South Africa