1. University of Rwanda, School of Medicine and Pharmacy, Department of Pharmacy, Butare, Rwanda
2. Pharmacognosy Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Bruxelles, Belgium
3. Université de Liège, CIRM, Laboratoire de Pharmacognosie, CHU B36, Liège, Belgium
4. Centre for Oxygen Research and Development (C. O. R.D), Institute of Chemistry B6a, University of Liège