Filippi M, Agosta F, Grosskreutz J, Benatar M, Kassubek J, Verstraete E, Turner MR; Neuroimaging Society in ALS (NiSALS). Progress towards a neuroimaging biomarker for amyotrophic lateral sclerosis. Lancet Neurol. 2015 Aug;14(8):786-788. [PubMed Link]