1. Faculty of Health Sciences, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa.
2. Medical Research Council of Zimbabwe, Ministry of Health and Child Welfare, Harare, Zimbabwe.
3. Letten Research Foundation, Harare, Zimbabwe.
4. Epidemiology and Strategic Information Unit, Human Sciences Research Council, Gauteng, South Africa.
5. Centre for Global Health, Department of Public Health, Aarhus University, Aarhus, Denmark.
6. University of Zimbabwe, College of Health Sciences, Harare, Zimbabwe.
7. Department of Clinical Biochemistry, Immunology and Genetics, Statens Serum Institute, Copenhagen, Denmark
8. Department of Medical Laboratory Sciences, College of Health Sciences, University of Zimbabwe, Harare, Zimbabwe.
9. Laboratory of Molecular Medicine, Copenhagen University, Rigshospitalet, Copenhagen, Denmark.
10. Tissue Typing Laboratory, Department of Clinical Immunology, Copenhagen University, Rigshospitalet, Copenhagen, Denmark.
11. Division of Women and Children, Rigshospitalet Oslo University Hospital and University of Oslo, Oslo, Norway.
12. University of Zimbabwe, Biochemistry Department, Harare, Zimbabwe and Department of Laboratory Medicine and Medical Sciences, University of KwaZulu Natal, Durban, South Africa.