[1] UNIV CALIF LOS ANGELES, HARBOR GEN HOSP,MED CTR,DEPT OBSTET & GYNECOL, DIV REPROD ENDOCRINOL, TORRANCE, CA 90509 USA
[2] UNIV CALIF LOS ANGELES, SCH MED, DEPT BIOMATH, LOS ANGELES, CA 90033 USA
[3] UNIV CALIF LOS ANGELES, HARBOR GEN HOSP, MED CTR, DEPT PEDIAT, TORRANCE, CA 90509 USA