This paper provides an excellent overview of issues, addresses common questions about the research use of protected health information (PHI), and presents definitions and interpretations of selected Privacy Rule terms with particular meaning to the conduct of research in practice-based settings. Click here to download.
Neale, Anne Victoria, Schwartz, Kendra L. A Primer of the HIPAA Privacy Rule for Practice-Based Researchers. Journal of the American Board of Family Practice 2004 17: 461-465.  http://www.jabfm.org/cgi/reprint/17/6/461.pdf