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Retraction Note: Efficient administration of a combination of Nifedipine and sildenafil citrate versus only Nifedipine on clinical outcomes in women with threatened preterm labor: a systematic review and meta-analysis

Crossref DOI link: https://doi.org/10.1186/s12887-026-06556-5

Published Online: 2026-02-07

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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