1. Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine, London, UK
2. Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
3. London Borough of Lambeth, London, UK
4. Centre for Reproductive Research & Communication, British Pregnancy Advisory Service, London, UK
5. NHS Lothian, Chalmers Centre, Edinburgh, UK
6. Queen’s Medical Research Institute, The University of Edinburgh MRC Centre for Reproductive Health, Edinburgh, UK