[1] Univ Pavia, Dept Brain & Behav Sci, Pavia, Italy
[2] IRCCS Mondino Fdn, Pavia, Italy
[3] Univ Hosp Basel, Dept Biomed, Basel, Switzerland
[4] UCL Queen Sq Inst Neurol, Dept Neuromuscular Dis, London, England
[5] Natl Hosp Neurol & Neurosurg, London, England
[6] Univ Pavia, Dept Mol Med, Pavia, Italy