Gauging cell phones' possible risk.
D001932:Brain Neoplasms / Q000209:etiology*; D040421:Cell Phone; D003257:Consumer Product Safety; D006801:Humans; D011840:Radiation, Nonionizing / Q000009:adverse effects*; D011846:Radio Waves / Q000009:adverse effects*; D012307:Risk Factors; D013997:Time Factors