1. Department of Neurology, FLENI, Buenos Aires, Argentina;
2. Department of Neurology, Sanatorio Finochietto, Buenos Aires, Argentina;
3. Department of Neurology, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina;
4. Department of Neurology, Hospital Nacional Alejandro Posadas, Buenos Aires, Argentina;
5. Department of Neurology, Sanatorio Güemes, Buenos Aires, Argentina;
6. Department of Neurology, Sanatorio de los Arcos, Buenos Aires, Argentina; and
7. Department of Neurology, Hospital J.M. Ramos Mejía, Buenos Aires, Argentina.