1. American Hospital Association. Trends affecting hospitals and health systems. 2012. Available at: http://www.aha.org/research/reports/tw/chartbook/2012/chapter2.pdf. Accessed March 22, 2013.
2. Wait time for treatment in hospital emergency departments: 2009;Hing;NCHS Data Brief,2012
3. Systematic review of emergency department crowding: causes, effects, and solutions;Hoot;Ann Emerg Med,2008
4. Reducing frequent flyer emergency department visits;Michelen;J Health Care Poor Underserved,2006
5. Emergency department use in New York City: a substitute for primary care?;Billings;Commonw Fund,2000