1 Center for Research, Education, and Quality, Mednax, Inc, Sunrise, FL; Obstetrix Medical Group, Campbell, CA.
2 Department of Obstetrics and Gynecology, University of Washington, Seattle, WA.
3 Center for Research, Education, and Quality, Mednax, Inc, Sunrise, FL; Department of Obstetrics and Gynecology, University of California Irvine, Irvine, CA.