1. The ER, 50 years on;Kellermann;N Engl J Med,2011
2. Emergency medical services: At the crossroads;Institute of Medicine (IOM),2007
3. OSPHD reports discharges that occurred during a given reporting period. We use the terms admissions and discharges inter-changeably.
4. McCconville, S., Danielson, C., Hsia, R., Emergency department use in California: Demographics, trends, and the impact of the ACA, Public Policy Institute of California, February 2019. https://www.ppic.org/publication/emergency-department-use-in-california-demographics-trends-and-the-impact-of-the-aca/
5. Frequent emergency department users: a statewide comparison before and after affordable care act implementation;McConville;Health Aff,2018