[1] NORTHWESTERN UNIV, MED SCH, DEPT OBSTET & GYNECOL, EVANSTON, IL USA
[2] NORTHWESTERN UNIV, MED SCH, DEPT BIOCHEM, EVANSTON, IL USA
[3] NORTHWESTERN UNIV, MED SCH, DEPT PATHOL, EVANSTON, IL USA
[4] EVANSTON HOSP, DEPT OBSTET & GYNECOL, EVANSTON, IL USA
[5] VET ADM HOSP, RES AGING LAB, DOWNEY, IL USA
[6] EVANSTON HOSP, DEPT PATHOL, EVANSTON, IL USA