1. School of Medicine and Health, University College Cork , Cork , Ireland
2. Pregnancy Loss Research Group (PLRG), Department of Obstetrics and Gynaecology, University College Cork , Cork , Ireland
3. Cork University Hospital , Cork , Ireland
4. Cork University Maternity Hospital , Cork , Ireland
5. The Irish Centre for Maternal and Child Health Research (INFANT), University College Cork , Cork , Ireland
6. National Perinatal Epidemiology Centre, University College Cork , Cork , Ireland
7. Department of Obstetrics and Gynaecology , School of Medicine and Health, University College Cork , Cork , Ireland