1. Department of Obstetrics and Gynecology, Douala General Hospital, Douala, Cameroon
2. Faculty of Health Sciences, University of Buea, Buea, Cameroon
3. Mbingo Baptist Hospital Annexe, Douala, Cameroon
4. District Hospital Poli, Poli, Cameroon
5. Faculty of Science, University of Buea, Buea, Cameroon