St. Bartholomew’s Hospital (Barts) - Centre for Reproductive Medicine, Liverpool Women's Hospital - Hewitt Fertility Centre, Queen Mary University of London - Centre for Women's Health, St. Bartholomew’s Hospital (Barts) - Centre for Reproductive Medicine, Pennsylvania State University - Department of Obstetrics and Gynecology, Monash University, Monash University, School of Public Health and Preventive Medicine, Monash Centre for Health Research and Implementation, University of Birmingham - Tommy’s National Centre for Miscarriage Research, Queen Mary University of London - Women's Health Research Unit and University of Birmingham - Institute of Metabolism and Systems Research