[1] Univ Chicago Med, Dept Obstet & Gynecol, 5841 S Maryland Ave, Chicago, IL 60637 USA
[2] Univ Kansas, Sch Med, Med Ctr, 3901 Rainbow Blvd, Kansas City, KS 66160 USA
[3] Univ Kansas, Dept Populat Hlth, Med Ctr, 3901 Rainbow Blvd, Kansas City, KS 66160 USA
[4] Univ Kansas, Dept Obstet & Gynecol, Med Ctr, 3901 Rainbow Blvd, Kansas City, KS 66160 USA
[5] 3901 Rainbow Blvd,Mailstop 2028, Kansas City, KS 66160 USA