1. National Guideline Clearinghouse. Available at: www.guideline.gov/search/advanced-search.aspx. Accessed January 9, 2013
2. Institute of Medicine. Clinical practice guidelines we can trust. In: Graham R, Mancher M, Wolman DM, Greenfield S, Steinberg E, eds. Washington, DC: The National Academies Press; 2011. Available at: www.nap.edu/catalog.php?record_id=13058. Accessed January 26, 2013
3. Guiding in the face of minimal evidence: a strength, not a weakness, of graded clinical guidelines;File;Infect Dis Clin Pract,2010
4. Practice guidelines developed by specialty societies: the need for a critical appraisal;Grilli;Lancet,2000