1. Department of Internal Medicine Douala General Hospital Douala Cameroon
2. Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon
3. Physiology and Medicine of Physical Activities and Sports Unit University of Douala Douala Cameroon
4. Faculty of Medicine and Biomedical Sciences University of Yaoundé I Douala Cameroon
5. Faculty of Medicine and Biomedical Sciences University of N'Gaoundéré Douala Cameroon
6. Faculty of Health Sciences University of Buea Douala Cameroon