report http://www.nejm.org/doi/full/10.1056/NEJMhpr1405667 over 20 million to date http://www.nejm.org/doi/full/10.1056/NEJMhpr1405667 eligibility reported in July New England Journal of Medicine http://www.nejm.org/doi/full/10.1056/NEJMhpr1405667 http://www.nejm.org/doi/full/10.1056/NEJMhpr1405667 an article from the NEJM Blumenthal and Collins report www.nejm.org new coverage provisions http://www.nejm.org/doi/full/10.1056/NEJMhpr1405667 20 million NEJM article