1. University of Leeds; Nutritional Epidemiology Group, Centre for Epidemiology and Biostatistics; Worsley Building, Level 8, Room 9.01 Clarendon Way Leeds West Yorkshire UK LS2 9JT
2. Bradford Hospitals NHS Trust; Bradford Royal Infirmary Maternity Unit; Smith Lane Bradford West Yorkshire UK BD9 6RJ
3. University of Leeds; Academic Unit of Public Health; Institute of Health Sciences Leeds UK LS2 9PL