Association of Slowly Expanding Lesions on MRI With Disability in People With Secondary Progressive Multiple Sclerosis.

Calvi A, Carrasco FP, Tur C, Chard DT, Stutters J, De Angelis F, John N, Williams T, Doshi A, Samson RS, MacManus D, Gandini Wheeler-Kingshott CA, Ciccarelli O, Chataway J, Barkhof F; MS SMART Investigators.