1. The Centre for Reproductive and Genetic Health (CRGH) London UK
2. Clinical Biostatistics Unit Hospital Universitario Ramon y Cajal (IRYCIS) Madrid Spain
3. CREATE Fertility London UK
4. London North West University Healthcare NHS Trust London UK
5. Women's Health Research Unit, Wolfson Institute of Population Health Queen Mary University of London London UK
6. Institute for Women's Health University College London London UK
7. Women's Health Department University College London Hospital London UK
8. Consortium for Biomedical Research in Epidemiology and Public Health (CIBER Epidemiology and Public Health CIBERESP) Clinical Biostatistics Madrid Spain
9. Institute of Metabolism and Systems Research University of Birmingham Birmingham UK