1. Centre for the Research and Rehabilitation of Hereditary Ataxias, El Llano, Holguin, Cuba
2. Medical University of Holguin, Holguin, Cuba
3. Cuban Neuroscience Centre, La Havana, Cuba
4. School of Medicine of Havana, Havana, Cuba
5. Clinical & Surgical Hospital “Lucia Iniguez”, Holguin, Cuba
6. Exp. Neurology, Medical Faculty, Goethe University, Frankfurt am Main, Germany
7. Cuban Academy of Sciences, La Habana, Cuba