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How reliable is pain as the fifth vital sign?
Lorenz KA, Sherbourne CD, Shugarman LR, Rubenstein LV, Wen L, Cohen A, Goebel JR, Hagenmeier E, Simon B, Lanto A, Asch SM. Lorenz KA, et al. Among authors: hagenmeier e. J Am Board Fam Med. 2009 May-Jun;22(3):291-8. doi: 10.3122/jabfm.2009.03.080162. J Am Board Fam Med. 2009. PMID: 19429735 Free article. Clinical Trial.