Distribution of emergency departments according to annual visit volume and urban-rural status: implications for access and staffing.
Muelleman RL, Sullivan AF, Espinola JA, Ginde AA, Wadman MC, Camargo CA. Distribution of emergency departments according to annual visit volume and urban-rural status: implications for access and staffing. Acad Emerg Med. 2010 Dec; 17(12):1390-7.