1. Department of Surgery and Specialties; Faculty of Medicine and Biomedical Sciences; University of Yaoundé I; Yaoundé Cameroon
2. Department of Internal Medicine and Specialties; Faculty of Medicine and Biomedical Sciences; University of Yaoundé I; Yaoundé Cameroon
3. Ibal Sub-divisional Hospital; Oku North-west Region Cameroon
4. Department of Medicine; Groote Schuur Hospital and University of Cape Town; Cape Town South Africa