Case mix of visits to hospital clinics in a large urban area.
D000553:Ambulatory Care / Q000145:classification*; D003625:Data Collection; D003953:Diagnosis-Related Groups; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D009519:New York City; D009819:Office Visits; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data*; D014505:Urban Population