Magistrale G, Pisani V, Argento O, Incerti CC, Bozzali M, Cadavid D, Caltagirone C, Medori R, DeLuca J, Nocentini U. Validation of the World Health Organization Disability Assessment Schedule II (WHODAS-II) in patients with multiple sclerosis. Mult Scler. 2015 Apr; 21(4):448-56.