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Smoking during Pregnancy Is Associated with a Decreased Incidence of Obstetric Anal Sphincter Injuries in Nulliparous Women
Räisänen S,
Vehviläinen-Julkunen K,
Gissler M,
Heinonen S
(2012)
Smoking during Pregnancy Is Associated with a Decreased Incidence of Obstetric Anal Sphincter Injuries in Nulliparous Women.
PLOS ONE 7(7): e41014.
https://doi.org/10.1371/journal.pone.0041014