The Agency for Healthcare Research and Quality (AHRQ), of the U.S. Department of Health and Human Services (HHS), supports research designed to improve the outcomes and quality of health care, reduce its costs, address patient safety and medical errors, and broaden access to effective services. The research sponsored, conducted, and disseminated by AHRQ provides information that helps people make better decisions about health care. Contact AHRQ online at www.ahrq.gov/info/customer.htm .