1. IRCCS-Fondazione Don Carlo Gnocchi, Via Capecelatro 66, 20148 Milan, Italy
2. Spinal Unit, Ospedale Niguarda Ca’ Granda, Piazza dell’Ospedale Maggiore 3, 20162 Milan, Italy
3. Spinal Unit, Ospedale Morelli, Via A. Zubiani 33, Sondalo, 23035 Sondrio, Italy
4. Laboratory of Neurological Disorders, Istituto Mario Negri, Via La Masa 19, 20156 Milan, Italy