EDUCATION of physicians MEDICAL protocols ACCESS to information CHI-squared test COMMUNITY health services COMPUTED tomography DIAGNOSTIC imaging ETHNIC groups FAMILY medicine LABOR incentives INFORMATION storage & retrieval systems MEDICAL databases INTERNAL medicine MAGNETIC resonance imaging MEDICAL care costs MEDICAL specialties & specialists PAY for performance PATIENTS PATIENT safety PEDIATRICS POISSON distribution RACE RADIOTHERAPY RESEARCH funding SURVEYS ULTRASONIC imaging EMAIL EMPLOYEES' workload THREE-dimensional imaging DESCRIPTIVE statistics ECONOMICS