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This is one in a series of chapters excerpted from the Clinical Evidence Handbook, published by the BMJ Publishing Group, London, U.K. The medical information contained herein is the most accurate available at the date of publication. More updated and comprehensive infor- mation on this topic may be available in future print editions of the Clinical Evidence Handbook, as well as online at http://www.clinicalevidence. bmj.com (subscription required). Those who receive a complimentary print copy of the Clinical Evidence Handbook from United Health Foundation can gain complimentary online access by register- ing on the Web site using the ISBN number of their book. © 2012 American Academy of Family Physicians.

Type

Journal article

Publication Date

2012-01-01T00:00:00+00:00

Volume

85

Pages

188 - 190

Total pages

2