1. Jefferson Medical College of Thomas Jefferson University; Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology; 834 Chestnut Street, Suite 400 Philadelphia Pennsylvania USA PA 19107
2. Virtua West Jersey Hospital; Division of Maternal Fetal Medicine; Voorhees New Jersey USA NJ 08043
3. Aurora Health Center; Division of Maternal Fetal Medicine; Milwaukee Wisconsin USA