1. Small Area Health Statistics Unit, Department of Epidemiology and Public Health, Faculty of Medicine, Imperial College London, St. Mary’s Campus, London, United Kingdom
2. Center for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
3. British Isles Network of Congenital Anomaly Registers, BINOCAR Management Committee, Newcastle-Upon-Tyne, United Kingdom
4. National Perinatal Epidemiology Unit, University of Oxford, Oxford, United Kingdom
5. North Thames Perinatal Public Health Unit, Northwick Park Hospital, Harrow, United Kingdom
6. Office for National Statistics, London, United Kingdom
7. Independent Consultant, High Wycombe, Buckinghamshire, United Kingdom