1. Department of Chemical Pathology, College of Health Sciences, University of Zimbabwe, Harare, Zimbabwe.
2. Department of Statistical Sciences, Faculty of Science, University of Cape Town, Cape Town, South Africa.
3. Division of Clinical Pharmacology, Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.
4. Department of Medical Laboratory Sciences, College of Health Sciences, University of Zimbabwe, Harare, Zimbabwe.
5. Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
6. Division of Human Genetics, Department of Clinical Laboratory Sciences and Institute for Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.
7. Newlands Clinic, Harare, Zimbabwe.