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1 Royal College of Obstetricians and Gynaecologists, London NW1 4RG, UK; Section of Obstetrics and Gynaecology, Faculty of Medicine, Imperial College London, London, UK. Electronic address: policy@rcog.org.uk.
2 College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK; Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine, London, UK.
1 Royal College of Obstetricians and Gynaecologists, London NW1 4RG, UK; Section of Obstetrics and Gynaecology, Faculty of Medicine, Imperial College London, London, UK. Electronic address: policy@rcog.org.uk.
2 College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK; Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine, London, UK.