Prepared for:

Agency for Healthcare Research and Quality

U.S. Department of Health and Human Services

540 Gaither Road

Rockville, MD 20850

www.ahrq.gov

Contract No. 290-02-0024

Task Order No. 2

Technical Support of the U.S. Preventive Services Task Force

Prepared by:

Oregon Evidence-based Practice Center

Portland, Oregon

Craig Fleming, MD

Evelyn Whitlock, MD, MPH

Tracy Beil, MS

Barbara Smit, MD, PhD

March 2005