1. Trends in hospital emergency department utilization: United States, 1992-99;Burt;Vital & Health Statistics - Series 13: National Health Survey,2001
2. National Hospital Ambulatory Medical Care Survey: 2003 emergency department summary;McCaig;Adv Data.,2005
3. 3. American College of Emergency Physicians. Emergency Medicine Statistical Profile. Available from: http://www.acep.org/. Accessed Jul 18, 2008.
4. A conceptual model of emergency department crowding;Asplin;Ann Emerg Med.,2003
5. Crowding;American College of Emergency Physicians;Ann Emerg Med.,2006