1. Baylor College of Medicine, Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, 1 Baylor Plaza, Jones 314, Houston, TX 77030, USA
2. Baylor College of Medicine, Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, 1 Baylor Plaza, Jones 314, Houston, TX 77030, USA.