http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=hstat
National Library of Medicine, National Institutes of Health
The Health Services/Technology Assessment Text (HSTAT) is a free, Web-based resource of full-text documents that provide health information and support health care decision making. HSTAT's audience includes health care providers, health service researchers, policy makers, payers, consumers and the information professionals who serve these groups.