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On page 4 of the article above, the concentration unit of DNA damage measured by 8-OHdG, “ng/μg” creatinine, was provided incorrectly. It should be “ng/mg.” This error occurs in Fig. 2 and Table 3 and in the text on page 4 only: left column, lines 9, 11, and 14 from the bottom; right column, lines 2, 5, 17, and 27 from the top. The online version reflects this change.