1. Perinatology Research Branch, NICHD/NIH/DHHS, Bethesda, Maryland, USA
2. Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, USA
3. Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
4. Department of Obstetrics and Gynecology, Soroka Medical Center, Ben Gurion University of the Negev, Beer Sheva, Israel