title: Opening remarks.
authors: Ezekiel
authors: E
authors: Emanuel
mesh_terms: D060866:Accountable Care Organizations; D004465:Economic Competition; D006801:Humans; D006278:Medicare / Q000191:economics / Q000458:organization & administration / Q000639:trends*; D058991:Patient Protection and Affordable Care Act; D011057:Politics; D012051:Reimbursement Mechanisms; D014481:United States