1. Unit of Internal Medicine, University of Zimbabwe, Harare, Zimbabwe.
2. Department of Medicine, University of Stellenbosch, Cape Town, South Africa.
3. Department of Molecular Biology, Biomedical Research and Training Institute, Harare, Zimbabwe.
4. Newlands Clinic, Harare, Zimbabwe.
5. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland.
6. Graduate School of Health Sciences, University of Bern, Bern, Switzerland.
7. Chidamoyo Christian Hospital, Karoi, Zimbabwe.
8. Department of Laboratory Medicine and Investigative Sciences, University of Zimbabwe, Harare, Zimbabwe.
9. African Institute for Biomedical Sciences and Technology, Harare, Zimbabwe.