Charlotte Veyrat-Durebex2,3, Yves-Olivier Guettard2, William Camu6, Peter M Andersen4, Patrick Vourc'h2,3 and Christian R Andres2,3 Abnormal survival motor neuron 1 (SMN1)-copy number has been associated with an increased risk of amyotrophic lateral sclerosis (ALS) in French and Dutch ...