1. Women’s Health Research Unit, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
2. Department of Obstetrics and Gynaecology, University College London Hospital, London, UK
3. Clinical Biostatistics Unit, Hospital Ramon y Cajal (IRYCIS, CIBERESP), Madrid, Spain
4. Department of Obstetrics and Gynaecology, Barts Health NHS Trust, London, UK
5. Department of Anaesthesia, Barts Health NHS Trust
6. Multidisciplinary Evidence Synthesis Hub (mEsh), Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK