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Maternal cigarette smoking before and during pregnancy and the risk of preterm birth: A dose–response analysis of 25 million mother–infant pairs
- Buyun Liu,
- Guifeng Xu,
- Yangbo Sun,
- Xiu Qiu,
- Kelli K. Ryckman,
- Yongfu Yu,
- Linda G. Snetselaar,
- Wei Bao
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- Published: August 18, 2020
- https://doi.org/10.1371/journal.pmed.1003158