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Changes in concentration of CH3SH. Comparison of mean CH3SH, methyl mercaptan; Olfactory threshold levels, CH3SH > 0.5 ng/10 ml values between rinsing with ClO2 (n = 15) and rinsing without ClO2 (n = 15) by Student's t-test. *, p < 0.05; **, p < 0.01.
