cigarette smoking ulcerative colitis YMJ :: Yonsei Medical Journal GPR15 differentially regulates the effects
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![PDF] Quantification of Nicotine and Cotinine in Plasma, Saliva, and Urine by HPLC Method in Chewing Tobacco Users](https://figures.semanticscholar.org/90bf555bb6dc40da217fede2b3ba91b58f46ee1b/3-Figure2-1.png)








