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Wijesekera, L. C., Mathers, S., Talman, P., Galtrey, C., Parkinson, M. H., Ganesalingam, J., … Leigh, P. N. (2009). Natural history and clinical features of the flail arm and flail leg ALS variants. Neurology, 72(12), 1087–1094. doi:10.1212/01.wnl.0000345041.83406.a2 
10.1212/01.wnl.0000345041.83406.a2