1. Institute of Social and Preventive Medicine, University of BernBern Switzerland
2. National Cancer Registry, National Health Laboratory ServiceJohannesburg South Africa
3. Right to CareJohannesburg South Africa
4. Cytology Unit, Department of Anatomical PathologyUniversity of the WitwatersrandJohannesburg South Africa
5. Cytology Unit, National Health Laboratory ServiceJohannesburg South Africa
6. Department of Clinical MedicineUniversity of the WitwatersrandJohannesburg South Africa
7. Health Economics and Epidemiology Research Office, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the WitwatersrandJohannesburg South Africa