[1] Univ Michigan, Sch Med, Dept Obstet & Gynecol, Ann Arbor, MI USA
[2] Univ Michigan, Sch Med, Ctr Bioeth & Social Sci Med, North Campus Res Complex,Bldg 14,G016, Ann Arbor, MI 48109 USA
[3] Univ Penn, Dept Med Eth & Hlth Policy, Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Univ Michigan, Sch Med, Dept Otolaryngol Head & Neck Surg, Ann Arbor, MI USA