Disclaimer: This website is an archive of materials that were publicly available from the Community Preventive Services Task Force (CPSTF) and The Community Guide at the time they were collected. The American Academy of Family Physicians (AAFP) and the researchers who collected these materials are making them available as a convenience to users. The materials represent a point-in-time archive and may not reflect subsequent updates, corrections or current recommendations. The AAFP and the researchers make no representation or warranty as to the completeness, accuracy or currency of the archived materials and are not responsible for errors or omissions. Inclusion of these materials does not constitute endorsement by the AAFP. The information is provided for general informational purposes only and is not intended as medical advice or as a substitute for professional medical judgment. Users should consult appropriate current sources and exercise independent professional judgment before relying on the information.