Natalizumab plus interferon beta-1a reduces lesion formation in relapsing multiple sclerosis. - Radue EW; Stuart WH; Calabresi PA; Confavreux C; Galetta SL; Rudick RA; Lublin FD; Weinstock-Guttman B; Wynn DR; Fisher E; Papadopoulou A; Lynn F; et al. (Journal of the neurological sciences, 2010)