1. National University Teaching Hospital of Cotonou Cotonou Benin
2. Department of Public Health, Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon
3. Health Emergency Information and Risk Assessment, Department of Emergency Preparedness and Response, World Health Organization Regional Office for Africa Brazzaville Democratic Republic of the Congo
4. Department of Internal Medicine and Specialties, Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon
5. Yaoundé University Teaching Hospital Yaoundé Cameroon