1. Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston
2. Department of Pathology (Neuropathology), Massachusetts General Hospital, Boston
3. Department of Neuroscience, Reproductive Sciences and Odontostomatology, University “Federico II” of Naples, Naples, Italy
4. Skin Biopsy Laboratory, Department of Neurology, IRCCS, Istituti Clinici Scientifici Maugeri, SpA SB, Telese Terme, Italy