1. Elizabeth Garrett Anderson Institute for Women’s Health, University College London, London, UK
2. Department of Statistical Science, University College London, London, UK
3. Birmingham Clinical Trials Unit, Institute of Applied Health Research, University of Birmingham, Birmingham, UK
4. Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
5. Department of Women and Children’s Health, King’s College London, St Thomas’ Hospital, London, UK
6. Institute of Health Economics, School of Social and Community Medicine, University of Bristol, Bristol, UK
7. Modelling and Analytical Systems Solutions Ltd, Edinburgh, UK
8. The Miscarriage Association, Wakefield, UK