[1] Northwestern Univ, Feinberg Sch Med, Dept Obstet & Gynecol, Chicago, IL 60611 USA
[2] Northwestern Univ, Feinberg Sch Med, Dept Urol, Chicago, IL 60611 USA
[3] Loyola Univ Chicago, Stritch Sch Med, Dept Obstet & Gynecol, Maywood, IL USA
[4] Loyola Univ Chicago, Stritch Sch Med, Dept Urol, Maywood, IL USA
[5] Univ Hlth Consortium, Dept Data & Informat Res, Chicago, IL USA