title: More than 4.2 million have signed up for US health insurance on Affordable Care Act exchanges.
authors.affiliation: Seattle.
authors.forename: Michael
authors.initials: M
authors.lastname: McCarthy
mesh_terms: D062265:Health Insurance Exchanges / Q000706:statistics & numerical data*; D006801:Humans; D058991:Patient Protection and Affordable Care Act / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology