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. 2012 Jan 17;7(1):e30291. doi: 10.1371/journal.pone.0030291

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FMD and glyceryl trinitrate (GTN)-induced vasodilation in non-smokers and smokers (A); correlation between FMD and intracellular concentrations of GSH in PBMC of non-smokers and smokers (B). Data are presented as mean±SD; FMD and GTN are expressed as maximal percentage change in brachial artery dilation. *P<0.001 versus non-smokers.