1. Division of Maternal Fetal Medicine, Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA;
2. Division of General Obstetrics & Gynecology, Michigan State University Women’s Health Center, Lansing, MI, USA;
3. Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Michigan State University/Sparrow Hospital, Lansing, MI, USA