1. Obstetrics and Gynecology, National Maternity Hospital, Dublin, Ireland
2. Obstetrics and Gynecology, Cork University Maternity Hospital, Cork, Ireland
3. UCD School of Medicine, University College Dublin, Dublin, Ireland
4. Midwifery, National Maternity Hospital, Dublin, Ireland
5. UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland