27 Other authors have reported higher levels of r-1, t-2, 3, c-4-tertrahydroxy-1, 2, 3, 4-tetrahydrophenanthrene (Phe-T), a metabolite of the PAH phenanthrene in non-smokers from Shanghai compared with non-smokers in the USA, but are unaware of a direct comparison of multiple PAH metabolites in Chinese versus US smokers, or of prior studies in which PAH exposure was normalised for nicotine intake (a marker of total smoke exposure)
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