1 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Baylor College of Medicine, 6651 Main St., Ste. F1020, Houston, TX 77030; Texas Children's Hospital, Houston, TX. Electronic address: vidaeff@bcm.edu.
2 Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Baylor College of Medicine, 6651 Main St., Ste. F1020, Houston, TX 77030; Texas Children's Hospital, Houston, TX.
3 Department of Obstetrics and Gynecology, Columbia University, New York, NY.
4 Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, OR.
5 Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
6 Department of Obstetrics and Gynecology, University of Texas Medical Branch at Galveston, Galveston, TX.