*Hammersmith Hospital, Imperial College NHS Trust

†Imperial College London

‡Cutrale Perioperative and Ageing Group, Sir Michael Uren Hub, Imperial College London

§Lister Fertility Clinic, The Lister Hospital

∥EGA Institute for Women’s Health, UCL

¶IVI London, IVIRMA Global, London

#The Oxford Transplant Centre, The Churchill Hospital, Oxford University Hospitals NHS Trust, Oxford, United Kingdom

B.P.J. and L.K. are joint first authors.

B.P.J. and L.K.: the article was conceived and written. M.C.: helped write the manuscript and revised the final draft. S.V., S.S., T.B.M., M.Y.T., J.N., C.D.-G., I.Q., J.Y., and J.R.S.: reviewed and contributed expertise to the manuscript.

The authors declare that they have nothing to disclose.

Correspondence: Benjamin P. Jones, MBChB, BSc (Hons), MRCOG, Department of Surgery and Cancer, Imperial College London, Du Cane Road, London, UK. E-mail: [email protected]