1. Institute of Medical Research and Medicinal Plant Studies, (IMPM), P.O. Box 6163, Yaoundé, Cameroon
2. Institute of Fisheries and Aquatic Sciences, University of Douala, PO Box 2701, Douala, Cameroon
3. Department of Biochemistry, Faculty of Science, University of Douala, PO Box 24157, Douala, Cameroon
4. Laboratoire de Pharmacognosie, Département de Pharmacie, Centre Interdisciplinaire de Recherche sur le Médicament (CIRM), Université de Liège, B36, B-4000 Liège, Belgium