Pamela Michelow1, Cynthia Firnhaber2. 1. Cytology Unit, Department of Anatomical Pathology, Faculty of Health Sciences, University of the Witwatersrand and National Health Laboratory Service, Johannesburg, South Africa. pamela.michelow@nhls.ac.za. 2. Department of Internal Medicine, Faculty of Health Science, University of Witwatersrand and Right to Care, Johannesburg, South Africa.