1. Director of the Obstetrics and Gynecology Department Sant Pau University Hospital, Universitat Autònoma de Barcelona Barcelona Spain
2. Maternal and Child Health and Development Network II (SAMID II) RD16/0022 Institute of Health Carlos III Madrid Spain
3. Department of Medicine University of Maryland School of Medicine Baltimore Maryland
4. Department of Pediatrics University of Maryland School of Medicine Baltimore Maryland
5. Department of Obstetrics and Gynecology and Reproductive Sciences University of California San Diego San Diego California
6. Department of Physiology and Biophysics University of Maryland School of Medicine Baltimore Maryland