1. Homerton Fertility Centre, Homerton University Hospital NHS foundation Trust, London, United Kingdom;
2. NHS Grampian, Aberdeen Fertility Centre, Aberdeen, United Kingdom;
3. Jessop Fertility, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom;
4. Fertility Network UK, East Sussex, United Kingdom;
5. Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom