Letter: Mortality and natural fluoride content of drinking-water.
D005457:Fluoridation; D005459:Fluorides / Q000032:analysis*; D006331:Heart Diseases / Q000453:epidemiology / Q000401:mortality*; D006801:Humans; D008274:Magnesium / Q000032:analysis; D014881:Water Supply / Q000032:analysis*
D008274:Magnesium; D005459:Fluorides