Ambulatory visit groups: implications for hospital outpatient departments.
D000553:Ambulatory Care / Q000145:classification*; D001900:Boston; D003625:Data Collection; D003953:Diagnosis-Related Groups / Q000379:methods*; D005069:Evaluation Studies as Topic; D009519:New York City; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data*; D014481:United States