Korean Journal of Family Practice
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Kim N, Ha J, Kim K, Lee S, Kim J, Paek J.  Trends in Secondhand Smoking and Urine Cotinine Concentration in Non-Smoking Adults in Korea: The 2008–2011, 2014–2018 Korea National Health and Nutrition Examination Survey.  KJFP 2020;10:378-385.  https://doi.org/10.21215/kjfp.2020.10.5.378
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