1. Department of Obstetrics and Gynecology, Faculty of Medicine and Biomedical Sciences, University Teaching Hospital, Yaoundé, Cameroon;
2. Faculty of Medicine and Biomedical Sciences, Yaoundé, Cameroon;
3. Department of Hematology & Microbiology, Faculty of Medicine and Biomedical Sciences & University Teaching Hospital, Yaoundé, Cameroon;
4. Department of Surgery, Obstetrics and Gynecology, Faculty of Health Sciences, Douala General Hospital, University of Buéa, Buéa, Cameroon