1. Division of Maternal Fetal Medicine Madigan Army Medical Center Tacoma Washington USA
2. Department of Clinical Investigation Madigan Army Medical Center Tacoma Washington USA
3. Integrated Research Center for Fetal Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA
4. Department of Obstetrics Gynecology & Reproductive Sciences University of Maryland School of Medicine Baltimore Maryland USA
5. Department of Obstetrics & Gynecology University of Washington Medical Center Seattle Washington USA