Second opinions in perspective.
D006264:Health Benefit Plans, Employee / Q000191:economics*; D006746:Hospital Bed Capacity, 500 and over; D006801:Humans; D007348:Insurance, Health / Q000191:economics*; D009519:New York City; D012017:Referral and Consultation / Q000191:economics*; D013514:Surgical Procedures, Operative / Q000706:statistics & numerical data*