Cost Savings Diagnosis-Related Groups--trends Diagnostic Imaging--economics Fee Schedules--trends Fees, Medical--trends Forecasting Health Care Costs--trends Humans Insurance, Health, Reimbursement--trends Length of Stay Medicare--trends Office Visits--economics Outcome and Process Assessment, Health Care--economics Personnel Staffing and Scheduling--trends Prospective Payment System--trends Risk Assessment Time Factors Time Management Treatment Outcome United States Vascular Diseases--diagnosis Vascular Surgical Procedures--adverse effects