1. Faculty of Medicine and Biomedical Sciences; University of Yaoundé I; Yaoundé Cameroon
2. Guidiguis District Hospital; Guidiguis Cameroon
3. Medical and Social Welfare Center of the University of Maroua; Maroua Cameroon
4. Internal Medicine Unit; Edéa Regional Hospital; Edéa Cameroon
5. Mother and Child Centre; Chantal Biya Foundation; Yaoundé Cameroon
6. Division of Human Genetics; Department of Clinical Laboratory Sciences; Faculty of Health Sciences; University of Cape Town; Cape Town South Africa