[1] Univ Michigan, Sch Nursing, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Womens Studies Dept, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Midwifery Educ Program, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Pelv Floor Res Grp, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Dept Obstet & Gynecol, Ann Arbor, MI 48109 USA