1. Department of Organic Chemistry, Faculty of Science, TWAS Research Unit of University of Yaounde I
2. International Center for Chemical and Biological Sciences, University of Karachi
3. Medical Biochemistry Research Unit, Medicinal and Aromatic Plants Research Institute, National Center for Research, Sudan
4. Biochemistry and Biotechnology Department, Biology Faculty, Baku State University
5. Higher Teacher's Training College, University of Yaounde I
6. Department of Microbiology and Molecular Immunology, The Bloomberg School of Public Health, Johns Hopkins University