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Reports vary on what punishments Phelps would face if he tested positive for marijuana last November, but that's a moot point since there is no suggestion that he has failed any such tests

To assess the precision of the estimates, we calculated the mean squared error (MSE) using a parametric bootstrap procedure 16 , and on the basis of this we obtained the 95% confidence intervals for the prevalence ( 2-17

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Buccal cells showed a 40-fold increase in abnormal methylation sites compared to matched blood samples, making them a more reliable indicator of DNA changes