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Contributors A.d’A, KT and NV: contributed to the design of the work. NV: drafted the manuscript. All authors participated in critical revision of the manuscript and approved the final version.
Funding This work was performed as part of the ESHRE Guideline Development Program.
Competing interests NV and NLC are employed by ESHRE. All authors declare no financial relationships with any organisation that might have an interest in the submitted work in the previous 3 years, no other relationships or activities that could appear to have influenced the submitted work.
Provenance and peer review Not commissioned; externally peer reviewed.