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Docherty A, Owens A, Asadi-Lari M, Petchey R, Williams J, Carter YH.Docherty A, et al.Palliat Med. 2008 Mar;22(2):153-71. doi: 10.1177/0269216307085343.Palliat Med. 2008.PMID: 18372380Free article.Review.