AHRQ is requiring authors to submit peer-reviewed manuscripts to PubMed Central within 12 months of publication. By October 2015, AHRQ will require researchers to submit data to a repository.
Details here: AHRQ Public Access to Federally Funded Research: Publications and
February 2015. Agency for Healthcare Research and Quality,
**update** 2/23 - the AHRQ link isn't working and I don't see the policy posted elsewhere. This ARL post states "[AHRQ webpage temporarily unavailable while being revised]. "