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Ranked mean concentration of urinary 8-oxodG in samples from 9 healthy individuals (samples H1–9) and 10 head and neck cancer (samples P1–10) patients, analyzed by: (A) mass spectrometric detection; (B) electrochemical detection; (C) immunoassay. Each symbol represents a laboratory determination, with method of calibration, where appropriate, in parentheses. Also shown are within-technique mean values (★) and SD (red error bars).
