1. Department of Chemistry-Biochemistry, University of Health Science, Libreville, Gabon
2. Endocrinology Department, University Hospital of Libreville, Libreville, Gabon
3. Department of Metabolic Diseases and Nutrition, Research Institute of Health Sciences, Bobodioulasso, Burkina Faso
4. Chemistry Department, Masuku University of Science and Technology, Franceville, Gabon