1. Registrar in Obstetrics and Gynaecology, East Suffolk and North Essex NHS Foundation Trust, Ipswich Suffolk IP4 5PD UK
2. Senior Registrar, St John of God Midland Hospital 1 Clayton St, Midland, WA 6056 Australia
3. Consultant in Reproductive Medicine Cambridge University Hospitals NHS Foundation Trust Hills Road Cambridge CB2 0QQ UK
4. Associate Professor, Director of the Divisions of Obstetrics, Maternal Fetal Medicine and Ultrasound Department of Obstetrics and Gynaecology McGill University McGill University Health Centre,1001 Decarie Blvd, Montreal H4A 3J1 Quebec Canada
5. Consultant and Specialist in Reproductive Medicine, East Suffolk and North Essex NHS Foundation Trust, Ipswich Suffolk IP4 5PD UK