[1] Univ Michigan, Dept Obstet & Gynecol, Ann Arbor, MI 48109 USA
[2] Inst Healthcare Policy & Innovat, Ann Arbor, MI USA
[3] Univ Michigan, Sch Nursing, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Sch Med, Internal Med, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Sch Publ Hlth, Hlth Behav & Hlth Educ, Ann Arbor, MI 48109 USA
[6] Univ Michigan, Von Voigtlander Womens Hosp, Ann Arbor, MI 48109 USA
[7] Univ Michigan, Practice & Profess Grad Studies, Sch Nursing, Ann Arbor, MI 48109 USA
[8] Univ Michigan, Dept Obstet & Gynecol, Ann Arbor, MI USA