Methodology and problems in determining causal relationships between disease and geochemical environment. Disease data: epidemiologic considerations.
D000818:Animals; D004463:Ecology; D004777:Environment; D004782:Environmental Health; D004812:Epidemiologic Methods; D004813:Epidemiology; D055593:Geological Phenomena; D005844:Geology; D006801:Humans; D013312:Stress, Physiological; D014131:Trace Elements; D014481:United States; D014881:Water Supply
D014131:Trace Elements