1. North West Anglia NHS Foundation Trust Peterborough City Hospital Peterborough UK
2. Centre for Biostatistics Division of Population Health Health Services Research and Primary Care University of Manchester Manchester UK
3. Cochrane Gynaecology and Fertility Group University of Auckland Auckland New Zealand
4. Department of Obstetrics and Gynaecology Royal Free London NHS Trust London UK
5. Institute for Women’s Health University College London London UK
6. Barking, Havering and Redbridge University Hospitals NHS Trust Essex UK