1. Unité Microbiologie, Chimie Bioorganique et Macromoléculaire, Département R3D, Faculté de Pharmacie, Université Libre de Bruxelles (ULB), Brussels, Belgium
2. Department of Biological Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
3. Nanomaterials and Medicinal Organic Chemistry Laboratory, Department of Chemistry, Faculty of Science, Rhodes University, Grahamstown, South Africa
4. Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa
5. Programme in Medicine, Faculty of Health Science, University of Buea, Buea, Cameroon