The epidemiology of pain during the last 2 years of life.
Smith AK, Cenzer IS, Knight SJ, Puntillo KA, Widera E, Williams BA, Boscardin WJ, Covinsky KE.
Smith AK, et al.
Ann Intern Med. 2010 Nov 2;153(9):563-9. doi: 10.7326/0003-4819-153-9-201011020-00005.
Ann Intern Med. 2010.
PMID: 21041575
Free PMC article.