“Exploring the fitness hypothesis in ALS: a population-based case-control study of parental cause of death and lifespan” has been published in the Journal of Neurology, Neurosurgery & Psychiatry. This work was supported in part by JPND through the SOPHIA project, selected in the 2011 biomarker call, the STRENGTH project, selected in the 2012 risk factors call, and ALSCare, selected in the 2012 healthcare evaluation call.