http://www.ahrq.gov/clinic/uspstfix.htm

The USPSTF is an independent panel of non-Federal experts in prevention and evidence-based medicine and is composed of primary care providers. The USPSTF conducts scientific evidence reviews of a broad range of clinical preventive health care services (such as screening, counseling, and preventive medications) and develops recommendations for primary care clinicians and health systems. These recommendations are published in the form of "Recommendation Statements."