Occasional essay: Upper motor neuron syndrome in amyotrophic lateral sclerosis
Michael Swash, David Burke, Martin R Turner, Julian Grosskreutz, P Nigel Leigh, Mamede deCarvalho, Matthew C Kiernan
Journal of Neurology, Neurosurgery & Psychiatry Mar 2020, 91 (3) 227-234; DOI: 10.1136/jnnp-2019-321938