[The etiology of motor neuron disease].
D000328:Adult; D000367:Age Factors; D000690:Amyotrophic Lateral Sclerosis / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D009133:Muscular Atrophy / Q000209:etiology*; D013118:Spinal Cord Diseases / Q000209:etiology*