Nuffield Department of Women’s & Reproductive Health, University of Oxford, Oxford, United Kingdom (P.M.); Tommy’s National Centre for Miscarriage Research, Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, United Kingdom (R.D.-S., A.D., A.C.); and WHO Collaborating Centre for Global Women’s Health, Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, United Kingdom (A.I., A.D., A.C.)