1. Department of Obstetrics and Gynecology (S.S., H.F., M.N., A.A.-H.), University of Texas Medical Branch, Galveston, Texas 77555
2. Laboratory of Proteomics and Analytical Technologies (X.X., T.D.V.), SAIC-Frederick, Inc., Frederick, Maryland 21702
3. Department of Obstetrics and Gynecology (A.J.D.), Yale University, New Haven, Connecticut 06511