[1] NIH, NICHD, DHHS, Perinatol Res Branch, Bethesda, MD 20892 USA
[2] Wayne State Univ, Dept Pathol, Detroit, MI 48202 USA
[3] Brigham & Womens Hosp, Harvard Med Sch, Dept Obstet & Gynecol, Boston, MA 02115 USA
[4] Univ Calif San Diego, Dept Pathol, San Diego, CA 92103 USA
[5] Semmelweis Univ, Dept Obstet & Gynecol 1, Budapest, Hungary
[6] Wayne State Univ, Dept Med & Mol Genet, Detroit, MI USA