1. Department of Obstetrics and Gynecology, St Georgés University Hospitals NHS Foundation Trust/St George’s, University of London, London, UK
2. Reproductive Medicine Unit, EGA Wing, University College London Hospital, London, UK
3. Faculty of Health, Education, Medicine and Social Care, Anglia Ruskin University, Chelmsford, UK
4. The Chelmsford Private Day Surgery Hospital, Chelmsford, UK