title: ACOs--promise, not panacea.
authors.forename: Donald M
authors.initials: DM
authors.lastname: Berwick
mesh_terms: D017046:Cost Savings; D006123:Group Practice / Q000191:economics*; D005102:Health Expenditures / Q000706:statistics & numerical data*; D006801:Humans; D006278:Medicare / Q000191:economics*; D012052:Reimbursement, Incentive