1. Department of Obstetrics and Gynaecology; Trinity College Dublin; Coombe Women and Infants University Hospital; Dublin Ireland
2. Mid-Western Regional Maternity Hospital; Limerick Ireland
3. Department of Obstetrics and Gynaecology; Graduate Entry Medical School; University of Limerick; Mid-Western Regional Maternity Hospital; Limerick Ireland
4. University College Dublin; Coombe Women & Infant's University Hospital; Dublin Ireland
5. Bristol Randomised Trials Collaboration School of Social and Community Medicine; University of Bristol; Bristol UK