[1] Natl Acad Med, Washington, DC USA
[2] Univ Calif San Francisco, Dept Pediat, Philip R Lee Inst Hlth Policy Studies, San Francisco, CA 94127 USA
[3] Univ Calif San Francisco, Dept Pediat, Div Adolescent & Young Adult Hlth, San Francisco, CA 94127 USA
[4] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[5] Scrimshaw Consulting, Thornton, NH USA
[6] Harvard Univ, Cambridge, MA USA
[7] AcademyHealth, Washington, DC USA
[8] George Washington Univ, Washington, DC USA
[9] Brierley Consultancy, Highlands Ranch, CO USA
[10] Northwestern Univ, Dept Obstet & Gynecol, Chicago, IL USA
[11] Colorado Sch Publ Hlth, Aurora, CO USA
[12] Natl Acad Sci Engn & Med, Washington, DC USA
[13] Univ North Carolina, Gen Obstet Gynecol & Midwifery, Chapel Hill, NC USA