1. Tommy's National Centre for Miscarriage Research; Institute of Metabolism and Systems Research; University of Birmingham; Birmingham UK
2. National Perinatal Epidemiology Unit; Oxford UK
3. Chelsea and Westminster Hospital; London UK
4. St Michael's Hospital; Bristol UK
5. Birmingham Women's Hospital; Edgbaston UK
6. Liverpool Women's Hospital; Liverpool UK
7. The Queen's Medical Research Institute; University of Edinburgh and Royal Infirmary of Edinburgh; Edinburgh UK
8. Central Manchester University Hospitals; Saint Mary's Hospital; Manchester UK
9. NHS Ayrshire and Arran; Crosshouse Hospital; Kilmarnock Ayrshire UK
10. College of Medical & Dental Sciences; University of Birmingham; Birmingham UK
11. Hospital Ramon y Cajal; Madrid Spain
12. Heart of England NHS Foundation Trust; Heartlands Hospital; Bordesley Green East UK
13. King's College Hospital; London UK
14. Tommy's National Centre for Miscarriage, Research, Queen Charlotte's and Chelsea Hospital; Imperial College London; London UK
15. University College Hospital; London UK