Determining the effectiveness of early intensive versus escalation approaches for the treatment of relapsing-remitting multiple sclerosis: The DELIVER-MS study protocol by Ontaneda, D, Tallantyre, E, Raza, P, Planchon, S, Nakamura, K, Miller, D, Hersh, C, Craner, M, Bale, C, Chaudhry, B, Gunzler, D, Love, T, Gerry, S, Coles, A, Cohen, J, Evangelou, N