Data base compares productivity.
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Nugent
D003625:Data Collection; D016208:Databases, Factual; D017598:Efficiency, Organizational / Q000706:statistics & numerical data*; D008511:Medicine / Q000706:statistics & numerical data; D009819:Office Visits / Q000706:statistics & numerical data; D010820:Physicians / Q000706:statistics & numerical data*; D010865:Pilot Projects; D013038:Specialization; D014481:United States