1. Epidemiology and Public Health Group Faculty of Biology, Medicine and Health Division of Population Health, Health Services Research and Primary Care School of Health Sciences University of Manchester, Manchester Academic Health Science Centre Manchester UK
2. Centre for Biostatistics Faculty of Biology, Medicine and Health Division of Population Health, Health Services Research and Primary Care School of Health Sciences University of Manchester, Manchester Academic Health Science Centre Manchester UK
3. Department of Oncology and Metabolism School of Medicine and Biomedical Sciences University of Sheffield Sheffield UK
4. Jessop Fertility The Jessop Wing Sheffield Teaching HospitalsTree Root Walk Sheffield UK
5. Nutritional Epidemiology Group School of Food Science and Nutrition University of Leeds Leeds UK
6. Division of Preventive Medicine University of Alberta Edmonton AB Canada