1. Institute of Infectious Disease and Molecular Medicine, Division of Medical Virology, Department of Pathology, University of Cape Town, Cape Town 7925, South Africa
2. Wellcome Centre for Infectious Diseases Research in Africa (CIDRI-Africa), Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
3. Newlands Clinic, Harare P.O. Box A178, Zimbabwe
4. Department of Pharmacy and Pharmaceutical Sciences, University of Zimbabwe, Harare P.O. Box AI78, Zimbabwe
5. Medical Microbiology Unit, Department of Laboratory Diagnostic and Investigative Sciences, University of Zimbabwe, Harare P.O. Box AI78, Zimbabwe
6. Center for Immunization and Infection Research in Cancer, Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, 33612 FL, USA
7. Institute of Social and Preventive Medicine, University of Bern, 3012 Bern, Switzerland
8. Graduate School of Health Sciences, University of Bern, 3012 Bern, Switzerland
9. Burden of Disease Research Unit, South African Medical Research Council, Cape Town 7925, South Africa
10. SAMRC Gynaecological Cancer Research Centre, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa