Figure 1: Exposure to ETS and urinary nicotine and cotinine excretion in German Survey (Heinrich et al., 2004) and Bitterfeld Survey (children aged 11-14 years)
Figure 1: Exposure to ETS and urinary nicotine and cotinine excretion in German Survey (Heinrich et al., 2004) and Bitterfeld Survey (children aged 11-14 years)