AAN (American Academy of Neurology). 2004. Clinical practice guidelines process manual. http://www.aan.com/globals/axon/assets/3749.pdf (accessed July 28, 2009).
ACCF/AHA (American College of Cardiology Foundation/American Heart Association). 2009. Methodology manual for ACCF/AHA guideline writing committees. http://www.americanheart.org/downloadable/heart/12378388766452009MethodologyManualACCF_AHAGuidelineWritingCommittees.pdf (accessed July 29, 2009).
ACCP (American College of Chest Physicians). 2009. The ACCP grading system for guideline recommendations. http://www.chestnet.org/education/hsp/gradingSystem.php (accessed July 28, 2009).
CEBM (Centre for Evidence-Based Medicine). 2009. Oxford Centre for Evidence-based Medicine—Levels of Evidence (March 2009). http://www.cebm.net/index.aspx?o=1025 (accessed July 28, 2009).
Ebell, M. H., J. Siwek, B. D. Weiss, S. H. Woolf, J. Susman, B. Ewigman, and M. Bowman. 2004. Strength of recommendation taxonomy (SORT): A patient-centered approach to grading evidence in medical literature. American Family Physician 69(3):548–556.
GRADE Working Group (Grading of Recommendations Assessment, Development, and Evaluation Working Group). 2009. Grading the quality of evidence and the strength of recommendations http://www.gradeworkinggroup.org/intro.htm (accessed July 20, 2009).
ICSI (Institute for Clinical Systems Improvement). 2003. Evidence grading system. http://www.icsi.org/evidence_grading_system_6/evidence_grading_system__pdf_.html (accessed September 8, 2009).
Kish, M. A. 2001. Guide to development of practice guidelines. Clinical Infectious Diseases 32(6):851–854.
NCCN (National Comprehensive Cancer Network). 2008. About the NCCN clinical practice guidelines in oncology. http://www.nccn.org/professionals/physician_gls/about.asp (accessed September 8, 2009).
NZGG (New Zealand Guidelines Group). 2007. Handbook for the preparation of explicit evidence-based clinical practice guidelines. http://www.nzgg.org.nz/download/files/nzgg_guideline_handbook.pdf (accessed September 4, 2009).
SIGN (Scottish Intercollegiate Guidelines Network). 2009. SIGN 50: A guideline developer’s handbook http://www.sign.ac.uk/guidelines/fulltext/50/index.html (accessed July 20, 2009).
Steering Committee on Quality Improvement Management. 2004. Classifying recommendations for clinical practice guidelines. Pediatrics 114(3):874–877.
Tobe, S. W., R. M. Touyz, and N. R. C. Campbell. 2007. The Canadian Hypertension Education Program—a unique Canadian knowledge translation program. Canadian Journal of Cardiology 23(7):551–555.
USPSTF (U.S. Preventive Services Task Force). 2008. Grade definitions. http://www.ahrq.gov/clinic/uspstf/grades.htm (accessed July 28, 2009).