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Amyotrophic lateral sclerosis, physical exercise, trauma and sports: Results of a population-based pilot case-control studyBeghi, Ettore; Logroscino, Giancarlo; Chiò, Adriano; Hardiman, Orla; Millul, Andrea; Mitchell, Douglas; Swingler, Robert; Traynor, Bryan J. · Amyotrophic Lateral Sclerosis · 2010