Blues increase coverage, cut utilization in areas where HMOs are strong, study shows.
D054598:Blue Cross Blue Shield Insurance Plans / Q000191:economics / Q000458:organization & administration*; D006264:Health Benefit Plans, Employee / Q000191:economics; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D006761:Hospitals / Q000706:statistics & numerical data*; D007350:Insurance, Hospitalization / Q000458:organization & administration*; D007357:Insurance, Physician Services / Q000458:organization & administration*; D014481:United States