1. Department of Internal Medicine, Faculty of Health Sciences, University of Buea, Cameroon
2. Health and Human Development (2HD) Research Network, Douala, Cameroon
3. Department of Internal Medicine, Douala General Hospital, Douala, Cameroon
4. Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
5. Faculty of Medicine and Pharmaceutical Sciences, University of Dschang, Dschang, Cameroon