1. Department of Clinical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala , Douala, Littoral Region 24157, Cameroon
2. Deido District Hospital , Douala, Littoral Region 8037, Cameroon
3. Department of Animal Organisms, Faculty of Sciences, University of Douala , Douala, Littoral Region 24157, Cameroon
4. Garoua Regional Hospital , Garoua, North Region 121, Cameroon
5. Faculty of Medicine and Pharmaceutical Sciences, University of Dschang , Dschang, West Region 96, Cameroon
6. Douala General Hospital , Douala, Littoral Region 4856, Cameroon