1. Faculty of Science and Technology, Evangelical University of Cameroon, Bandjoun P.O. Box 127, Cameroon
2. Research Unit of Animal Physiology and Phytopharmacology, University of Dschang, Dschang P.O. Box 67, Cameroon
3. Faculty of Health Sciences, The University of Bamenda, Bambili P.O. Box 39, Cameroon
4. Department of Biology and Interdepartmental Centre for Comparative Medicine, University of Rome Tor Vergata, 00133 Rome, Italy