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Department of Women’s and Children’s Health, University of Padua, Salus Pueri, Padova, Italy Correspondence to: Amerigo Vitagliano, MD. Department of Women’s and Children’s Health, University of Padua, Salus Pueri, Via Giustiniani, 3, 35128 Padova PD, Italy. Email: amerigovitagliano.md@gmail.com. Provenance and Peer Review: This article was commissioned by the editorial office, Annals of Translational Medicine. The article did not undergo external peer review. Comment on: Huang J, Lu X, Xie Q, et al. Timing of frozen-thawed embryo transfer after controlled ovarian stimulation in a non-elective freeze-all policy. Ann Transl Med 2019;7:752.

Whether immediate frozen-thawed embryo transfer improves IVF outcome in non-elective freeze all policy