1. National Hospital Ambulatory Medical Care Survey: 2004 Emergency Department Summary;Centers for Disease Control and Prevention;Adv Data Vital Health Stat,2006
2. Inappropriate emergency department visits;Buesching;Ann Emerg Med,1985
3. The inappropriateness of “appropriateness”;Abbuhl;Acad Emerg Med,1996
4. Nonurgent use of the emergency department: appropriate or not?;Gill;Ann Emerg Med,1994
5. The urgency of visits to hospital emergency departments: data from the National Hospital Ambulatory Medical Care Survey (NHAMCS), 1992;Schappert;Stat Bull Metrop Insur Co,1995