ERYTHROBLASTS IN PERIPHERAL BLOOD AS AN OCCASIONAL FINDING IN MULTIPLE SCLEROSIS PATIENTS TREATED WITH NATALIZUMAB - Piris-Villaespesa, M; Velasco-Rodriguez, D; Marquet, J; Lopez-Gonzalez, S; Pinto-Solano, G; Costa-Frossard, L; Sainz de la Maza, S; Monreal, E; Alvarez-Cermeo, J C; Villarrubia, J (HAEMATOLOGICA, 2016)