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Positive test has raised concerns among consumers they may contract human disease equivalent, Creutzfeldt-Jakob disease

A key government panel has raised concerns about the reliability of the P.S.A. blood test, which is used to diagnose prostate cancer

The developing crisis at the Fukushima Daiichi nuclear power plant in the wake of the March 11 earthquake and tsunami has raised concerns over the health effects of radiation exposure: What is a "dangerous" level of radiation?