Department of Women's Cancer, Institute for Women's Health, UCL, London UK. Department of Occupational and Environmental Medicine, Frederiksberg-Bispebjerg University Hospital, Copenhagen, Denmark. Department of Gynaecological Oncology, Queen Alexandra Hospital, Portsmouth, UK. Massachusetts General Hospital Biostatistics, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA. Create Health Clinic, London, UK. Medical Research Council Clinical Trials Unit at University College London, London, UK. Centre for Women's Health, Institute of Human Development, University of Manchester, Manchester, UK. University of New South Wales, Sydney, New South Wales, Australia.