Maheshwari, AbhaBhattacharya, SiladityaBowler, UrsulaBrison, DanielChild, TimCole, ChristinaCoomarasamy, ArriCutting, RachelHarbottle, StephenHardy, PollyannaJuszczak, EdmundKhalaf, YacoubKurinczuk, Jennifer J.Lavery, StuartLewis-Jones, ClareMacklon, NickRaine-Fenning, Nick J.Rajkohwa, MadhurimaScotland, GrahamTroup, Stephen2020-01-222020-01-222019-06-13Maheshwari, A, Bhattacharya, S, Bowler, U, Brison, D, Child, T, Cole, C, Coomarasamy, A, Cutting, R, Harbottle, S, Hardy, P, Juszczak, E, Khalaf, Y, Kurinczuk, J J, Lavery, S, Lewis-Jones, C, Macklon, N, Raine-Fenning, N J, Rajkohwa, M, Scotland, G & Troup, S 2019, 'Study protocol : E-freeze-freezing of embryos in assisted conception: A randomised controlled trial evaluating the clinical and cost effectiveness of a policy of freezing embryos followed by thawed frozen embryo transfer compared with a policy of fresh embryo transfer, in women undergoing in vitro fertilisation', Reproductive Health, vol. 16, 81. https://doi.org/10.1186/s12978-019-0737-21742-4755ORCID: /0000-0002-4588-356X/work/159509644https://hdl.handle.net/2164/13559Acknowledgements The E-Freeze Collaborators Group contributed to the overall design of the E-Freeze trial. Funding The trial is approved and funded by the National Institute of Health Research (NIHR) Health Technology Assessment (HTA) programme. Availability of data and materials Applications for data sharing should be made to the NPEU CTU, using ctu@npeu.ox.ac.uk, with an accompanying protocol for the intended use of the data. This will be reviewed by the Trial Steering Committee if still operational or Data Sharing Committee/Data Controller. If approved, a Data Sharing Agreement will be compiled laying out the conditions to which the requestor must abide. Protocol E-Freeze Protocol, Version 2.0 (18/01/2017). Author notes All authors contributed equally to this work.111265195engAssisted conceptionElective freezingFertilityFresh embryo transferFrozen thawed embryo transferIVFOHSSReceptivityOvarian Hyperstimulation Syndrome/epidemiologyOvulation InductionEmbryo, MammalianHumansInfertility, Female/therapyFreezingYoung AdultFertilization in Vitro/legislation & jurisprudencePregnancy Complications/epidemiologyAdultFemalePregnancy RateEmbryo Transfer/methodsLive Birth/epidemiologyEmbryo ImplantationPregnancyCost-Benefit AnalysisCryopreservation/economicsAdolescentPregnancy OutcomeR MedicineObstetrics and GynaecologyReproductive MedicineNational Institute for Health Research (NIHR)RJournal article10.1186/s12978-019-0737-2http://www.scopus.com/inward/record.url?scp=85067290086&partnerID=8YFLogxK16