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Effects of co administration of gonadotropins and letrozole during the ovarian stimulation on IVF outcome for poor responders: a systematic review and meta-analysis of randomized controlled trials

Crossref DOI link: https://doi.org/10.1186/s12884-025-08127-5

Published Online: 2025-10-08

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

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