1. Department of Fetal Medicine, National Maternity Hospital, Dublin, Ireland
2. UCD Perinatal Research Centre, School of Medicine, National Maternity Hospital, University College Dublin, Dublin, Ireland
3. Department of Obstetrics and Gynaecology, Royal College of Surgeons in Ireland, Rotunda Hospital, Dublin, Ireland
4. Department of Obstetrics and Gynaecology, National University of Ireland, Galway, Ireland
5. Department of Obstetrics and Gynaecology, University College Cork, Cork, Ireland
6. Department of Obstetrics and Gynaecology, Coombe Women's and Infant's University Hospital, Dublin, Ireland
7. Royal Jubilee Maternity Hospital, Belfast, United Kingdom
8. Department of Obstetrics and Gynaecology, Graduate Entry Medical School, University of Limerick, Limerick, Ireland