[1] Royal College of Obstetricians and Gynaecologists,National Maternity and Perinatal Audit (NMPA), RCOG Centre for Quality Improvement and Clinical Audit
[2] University Hospitals Bristol NHS Foundation Trust,Department of Health Service Research and Policy
[3] London School of Hygiene and Tropical Medicine,Centre for Reproduction Research
[4] Population Health Analytics,Specialty of Obstetrics, Gynaecology and Neonatology, Westmead Clinical School
[5] Cerner,Faculty of Health and Life Sciences
[6] De Montfort University,undefined
[7] Royal Free London NHS foundation Trust,undefined
[8] University of Sydney,undefined
[9] De Montfort University,undefined