title: Amyotrophic lateral sclerosis and selenium.
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000139:chemically induced*; D004781:Environmental Exposure; D006801:Humans; D012643:Selenium / Q000009:adverse effects*; D013023:South Dakota; D014481:United States
chemical_list: D012643:Selenium