1. Division of Human Genetics , Department of Pathology, , Anzio Rd, Observatory, Cape Town, 7925 , South Africa
2. University of Cape Town, Health Sciences Campus , Department of Pathology, , Anzio Rd, Observatory, Cape Town, 7925 , South Africa
3. Department of Biochemistry and Molecular Biology, University of Buea , PO Box 63, South West Region, Buea , Cameroon
4. Medical Research Council Unit, The Gambia, at LSHTM , PO Box 273, Banjul , The Gambia
5. Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology , PO Box 62000, City Square, Nairobi , Kenya
6. Department of Applied Sciences , Faculty of Health and Life Sciences, , Newcastle, Tyne and Wear NE1 8ST , UK
7. Northumbria University , Faculty of Health and Life Sciences, , Newcastle, Tyne and Wear NE1 8ST , UK
8. West African Centre for Cell Biology of Infectious Pathogens, University of Ghana , PO Box LG 25, Legon, Accra , Ghana
9. McKusick-Nathans Institute of Genetic Medicine and Department of Genetic Medicine, Johns Hopkins University School of Medicine , 773 N. Broadway, MRB 439 , Baltimore, MD 21205 , USA