1. IRCCS Istituto delle Scienze Neurologiche di Bologna, UOC Clinica Neurologica Bologna Italy
2. Unit of Medical Genetics and Neurogenetics Fondazione IRCCS Istituto Neurologico Carlo Besta Milan Italy
3. Neurology Unit, Department of Biomedical and Neuromotor Sciences University of Bologna Bologna Italy
4. Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research and Center of Neurology University of Tübingen Tübingen Germany
5. German Center for Neurodegenerative Diseases Tübingen Germany
6. Studio Oculistico D'Azeglio Bologna Italy
7. IRCCS Ospedale San Raffaele Milan Italy
8. Unit of Child Neurology Fondazione IRCCS Istituto Neurologico Carlo Besta Milan Italy
9. Unit of Rare Neurodegenerative and Neurometabolic Diseases Fondazione IRCCS Istituto Neurologico Carlo Besta Milan Italy
10. Neuro‐Ophthalmology Center and Ocular Electrophysiology Laboratory, IRCCS Istituto Auxologico Italiano Capitanio Hospital Milan Italy
11. Department of Neuroscience University of Padua Padua Italy
12. Neurology Unit, Azienda Socio Sanitaria Territoriale Lodi Ospedale Maggiore di Lodi Lodi Italy
13. Beijing Genomics Institute‐Shenzhen Shenzhen China
14. Department of Medical‐Surgical Physiopathology and Transplantation University of Milan Milan Italy