Value of systematic genetic screening of patients with amyotrophic lateral sclerosis by Shepheard, SR, Parker, MD, Cooper-Knock, J, Verber, NS, Tuddenham, L, Heath, PR, Beauchamp, N, Place, E, Sollars, ESA, Project MinE ALS Sequencing Consortium, Turner, M, Malaspina, A, Fratta, P, Hewamadduma, C, Jenkins, TM, McDermott, CJ, Wang, D, Kirby, J, Shaw, PJ