. Author manuscript; available in PMC: 2013 Oct 29.
Published in final edited form as: Ann Emerg Med. 2011 Sep 9;59(1):10.1016/j.annemergmed.2011.07.032. doi: 10.1016/j.annemergmed.2011.07.032
© 2011 American College of Emergency Physicians. Published by Mosby, Inc. All rights reserved.
Figure 1. Study population.
