1. Department of Internal Medicine and Specialties Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon
2. Ministry of Public Health Yaoundé University Teaching Hospital Yaoundé Cameroon
3. Department for the Control of Disease, Epidemics and Pandemics Ministry of Public Health Yaoundé Cameroon
4. Ministry of Public Health Lafe‐Baleng Divisional Health Centre Bafoussam Cameroon