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. 2013 Jan 24;3(1):e002034. doi: 10.1136/bmjopen-2012-002034

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Distribution of urinary cotinine (ng/ml) according to active or passive tobacco exposure in pregnant women from the INfancia y Medio Ambiente cohort. Me, median; SHS, second-hand smoking; SRS Occas, self-reported smoking, occasional; SRS Daily, self reported smoking, daily.