Assessing ‘no evidence of disease activity’ status in patients with relapsing–remitting multiple sclerosis: a long-term follow-up oleh Chiara Zilli, Pietro Scribani Rossi, Arianna Di Stadio, Mariangela Fratino, Giada Giuliani, Rosanna Annecca, Gaetano Russo, Vittorio Di Piero, Marta Altieri