1. Department of Surgery, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
2. Department of Surgery and Specialties, Service of Anesthesia, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
3. Department of Internal Medicine, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
4. Department of Internal Medicine, Faculty of Medicine and Pharmacy, University of Douala, Douala, Cameroon