Diffuse axonal and tissue injury in patients with multiple sclerosis with low lesion load and no disability. - De Stefano,N.; Narayanan,S.; Francis,S.J.; Smith,S.; Mortilla,M.; Tartaglia,M.C.; Bartolozzi,M.L.; Guidi,L.; Federico,A.; Arnold,D.L. (Arch Neurol, 2002)