External validation of models for predicting cumulative live birth over multiple complete cycles of IVF treatment

Acknowledgements We are grateful to the HFEA for their permission to analyse the database, extracting the requested information, and assisting with all our queries in an efficient manner. We are also thankful to the data management support of the Grampian Data Safe Haven (DaSH) and the associated financial support of NHS Research Scotland, through NHS Grampian investment in the Grampian DaSH (www.abdn.ac.uk/iahs/facilities/grampian-data-safe-haven.php). Funding This work was supported by the Elphinstone scholarship scheme at the University of Aberdeen and the Assisted Reproduction Unit at Aberdeen Fertility Centre, University of Aberdeen. The funder did not have any role in the study design; data collection, data analysis, and interpretation of data; the writing of the report; nor the decision to submit the paper for publication. S.B. has a commitment of research funding from Merck.Peer reviewedPublisher PD