University of Oxford - Nuffield Department of Women’s and Reproductive Health, University of Southampton - Medical Research Council Life Course Epidemiology Unit, University of Oxford - Rheumatology and Musculoskeletal Sciences, University of Southampton - Medical Research Council Life Course Epidemiology Unit, Norwegian Institute of Public Health, K.G. Jebsen Center for Genetic Epidemiology, Norwegian University of Science and Technology, Deep Medicine, NDWRH, University of Oxford and Deep Medicine, NDWRH, University of Oxford