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Article Source: Smoking Is Associated with, but Does Not Cause, Depressed Mood in Pregnancy – A Mendelian Randomization Study
Lewis SJ, Araya R, Davey Smith G, Freathy R, Gunnell D, et al. (2011) Smoking Is Associated with, but Does Not Cause, Depressed Mood in Pregnancy – A Mendelian Randomization Study. PLOS ONE 6(7): e21689. https://doi.org/10.1371/journal.pone.0021689

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