1. Michael Johnson Foundation for Health Research, Vancouver, Canada
2. Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut
3. Department of Obstetrics and Gynecology, College of Medicine, University of Cincinnati, Cincinnati Ohio
4. Maternal and Fetal Health, University of Edinburgh Centre for Reproductive Biology, The Queen's Medical Research Institute, Edinburgh, United Kingdom
5. Department of Obstetrics and Gynecology, Virginia Commonwealth University, Richmond, Virginia
6. Obstetrics and Gynecology, Department of Pediatrics, Obstetrics and Reproductive Medicine, University of Siena, Siena, Italy,