Recommendations to improve imaging and analysis of brain lesion load and atrophy in longitudinal studies of multiple sclerosis. - Vrenken, H.; Jenkinson, M.; Horsfield, M.; Battaglini, M.; Schijndel, R.; Rostrup, E.; Geurts, J.; Fisher, E.; Zijdenbos, A.; Ashburner, J.; Miller, D.; Filippi, M.; et al. (Journal of Neurology, 2013)