1. Division of Health Research, Faculty of Health and Medicine, Lancaster University, Lancaster LA14AT, UK
2. Department of Clinical Neuropsychology, Manchester Centre for Clinical Neurosciences, Salford M68HD, UK
3. Centre for Neurological Rare Diseases (CMNR) of LIRH Foundation, 00161 Rome, Italy
4. Huntington and Rare Diseases Unit, IRCCS Casa Sollievo della Sofferenza Research Hospital, San Giovanni Rotondo, 71013 Foggia, Italy