[1] Sapienza Univ Rome, Dept Human Neurosci, Rome, Italy
[2] San Pietro Hosp, Multiple Sclerosis Ctr, Rome, Italy
[3] San Filippo Neri Hosp, Neurol Unit, Rome, Italy
[4] Univ Coll London Hosp, Dept Neuroinflammat, London, England
[5] Sapienza Univ Rome, Sch Med Stat & Biometry, Dept Publ Hlth & Infect Dis, Rome, Italy
[6] IRCCS Neuromed Mediterranean Neurol Inst, Pozzilli, Italy