Protection from cancer by 'silica' in the water-supply of U.S. cities.
D055598:Chemical Phenomena; D002621:Chemistry; D006801:Humans; D009369:Neoplasms / Q000453:epidemiology / Q000517:prevention & control*; D012822:Silicon Dioxide / Q000032:analysis* / Q000627:therapeutic use; D014481:United States; D014874:Water Pollutants, Chemical / Q000032:analysis; D014881:Water Supply / Q000032:analysis* / Q000592:standards
D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide