Article Title,Year,Volume,Issue,Page Range,Author Injury visits to hospital emergency departments: United States 1992-95,1998,,131,1-76,Fingerhut Ambulatory care visits of physician offices hospital outpatient departments and emergency departments: United States 1995,1997,,129,1-38,Schappert National Hospital Ambulatory Medical Care Survey: 1992 Emergency Department Summary,1997,,125,1-108,Schappert Ambulatory care visits to physician offices hospital outpatient departments and emergency departments: United States 1997,1999,,143,i-iv 1-39,Schappert National Ambulatory Medical Care Survey: 1995-96 summary,1999,,142,i-vi 1-122,Schappert