1. Faculté de Médecine et d'Odontostomatologie USTTB Bamako Mali
2. Division of Human Genetics, Department of Pathology, Faculty of Health Sciences University of Cape Town Cape Town South Africa
3. Neurogenetics Branch National Institute of Neurological Disorders and Stroke Bethesda Maryland USA
4. Service de Neurologie Centre Hospitalier Universitaire du Point “G” Bamako Mali
5. McKusick‐Nathans Institute, and Department of Genetic Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA