Correction to: BMC Pregnancy Childbirth 22, 234 (2022)
https://doi.org/10.1186/s12884-022-04552-y
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Following publication of the original article [1], the author reported that there is an error in the title: Norther instead of Northern. Correct article title is “The role of maternal age on the risk of preterm birth among singletons and multiples: a retrospective cohort study in Lombardy, Northern Italy”.
The original article [1] has been corrected.
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