1. 1University of Liege, CIRM, Laboratory of Pharmaceutical Analytical Chemistry, Department of Pharmacy, Liège, Belgium;
2. 2University of Yaoundé I, Faculty of Medicine and Biomedical Sciences, Yaoundé, Cameroon;
3. 3University of Kinshasa, Faculty of Pharmaceutical Sciences, Lemba, Kinshasa, Democratic Republic of the Congo;
4. 4Laboratoire National de Contrôle des Médicaments et Expertise, Yaoundé, Cameroon