227 Views | 104 Downloads
Maura K. Whiteman, PhD, Centers for Disease Control and Prevention, 4770 Buford Highway NE, Mailstop F-74, Atlanta, GA 30341-3724; acq5@cdc.gov..
The authors did not report any potential conflicts of interest.
Supported by Cooperative Agreement Number U48DP001909-01 from the Centers for Disease Control and Prevention.
© 2014 by The American College of Obstetricians and Gynecologists.