Role of "the Blues" in group legal plans.
D054598:Blue Cross Blue Shield Insurance Plans / Q000458:organization & administration*; D007341:Insurance / Q000458:organization & administration; D007350:Insurance, Hospitalization / Q000458:organization & administration*; D007357:Insurance, Physician Services / Q000458:organization & administration*; D007603:Jurisprudence; D014481:United States