1. Department of Neurology, Sanatorio de la Trinidad Mitre, Buenos Aires, Argentina;
2. Department of Movement Disorders, Fundación INEBA, Buenos Aires, Argentina;
3. Department of Neuro-opthamology, Hospital Oftalmológico Santa Lucía, Buenos Aires, Argentina;
4. Huntington and Rare Diseases Unit at IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy