Users groups: a model for data collection, analysis.
D054598:Blue Cross Blue Shield Insurance Plans / Q000706:statistics & numerical data*; D003132:Commerce; D003625:Data Collection / Q000379:methods*; D006264:Health Benefit Plans, Employee / Q000706:statistics & numerical data*; D007087:Illinois; D007348:Insurance, Health / Q000706:statistics & numerical data*; D007350:Insurance, Hospitalization / Q000706:statistics & numerical data*; D008962:Models, Theoretical