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this is your text and the corresponding reference:
Until recently, the system for grading guideline recommendations was
based on the work of the US Agency for Healthcare Research and Quality
(formerly the Agency for Health Care Policy and Research). 1
1 United States Department of Health and Human Services. Agency for
Health Care Policy and Research. Acute pain management: operative or
medical procedures and trauma. Rockville, MD: AHCPR, 1993:107. (Clinical
practice guideline No 1, AHCPR publication No 92-0023.)
Acute Pain Management: Operative or Medical Procedures and Trauma
Clinical Practice Guideline No. 1.
AHCPR Publication No. 92-0032: February 1992
the publication number and the year are different from your citation
what is the original first publication where the ahcpr "grades of
recommendation" are reported?
the above mentioned publication, that is cited in your article does report
the "levels of evidence" in appendix b, however, it does not report the
"grades of recommendation" in this guideline.