1. Laboratory of Animal Physiology, Department of Animal Biology and Physiology, Faculty of Science; University of Yaounde 1; PO Box 812; Yaounde; Cameroon
2. Department of Internal Medicine and Specialties, Faculty of Medicine and Biomedical Sciences; University of Yaounde 1; PO Box 8046; Yaounde; Cameroon
3. Division of Pharmacognosy and Natural Products Chemistry, School of Pharmacy; University of Athens; Panepistimioupoli Zografou; 15771; Athens; Greece