Focus group in Multiple Sclerosis as a tool to increase active patient involvement. A preliminary experience. Issue 1 (December 2015) - Sgoifo, Annalisa; Bignamini, A; Celani, M; La Mantia, L; Esposito, M; Marazzi, R; Prone, V; Protti, A; Sangalli, V; Agostoni, E