1. Where Americans get acute care: increasingly, it’s not at their doctor's office;Pitts;Health Aff (Millwood),2010
2. Chen PW. Where have all the primary care doctors gone? New York Times. Available at: http://well.blogs.nytimes.com/2012/12/20/where-have-all-the-primary-care-doctors-gone/. Accessed January 2, 2016.
3. Insurance status and access to urgent ambulatory care follow-up appointments;Asplin;JAMA,2005
4. Emergency department visits for nonurgent conditions: systematic literature review;Uscher-Pines;Am J Manag Care,2013
5. Frequent overcrowding in US emergency departments;Derlet;Acad Emerg Med,2001