[1] Columbia Univ Coll Phys & Surg, 630 W 168th St, New York, NY 10032 USA
[2] Soc Obstet Anesthesia & Perinatol, Milwaukee, WI USA
[3] Kaiser Permanente, Riverside Med Ctr, Riverside, CA USA
[4] Yale Women & Childrens Ctr Blood Disorders & Pree, New Haven, CT USA
[5] Assoc Womens Hlth, Obstet & Neonatal Nurses, Washington, DC USA
[6] Amer Acad Family Phys, Leawood, KS USA
[7] Calif Maternal Qual Care Collaborat, Stanford, CA USA
[8] Amer Coll Nurse Midwives, Silver Spring, MD USA
[9] Amer Coll Obstetricians & Gynecologists, Washington, DC USA
[10] Texas Childrens Hosp, Baylor Coll Med, Houston, TX USA