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4. Ambulatory care visits to physician offices, hospital outpatient departments, and emergency departments: United States, 1996. Schappert SM. Vital Health Stat 13; 1998 Feb; (134):1-37. PubMed ID: 9564280 [Abstract] [Full Text] [Related]
17. National Hospital Ambulatory Medical Care Survey: 2000 outpatient department summary. Ly N, McCaig LF. Adv Data; 2002 Jun 04; (327):1-27. PubMed ID: 12661587 [Abstract] [Full Text] [Related]