Blues' second opinion plans growing but, so far, few are using option.
D054598:Blue Cross Blue Shield Insurance Plans / Q000191:economics*; D006801:Humans; D007350:Insurance, Hospitalization / Q000191:economics*; D007357:Insurance, Physician Services / Q000191:economics*; D012017:Referral and Consultation / Q000191:economics* / Q000706:statistics & numerical data; D013514:Surgical Procedures, Operative; D014481:United States