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Knudsen AK, Brunelli C, Kaasa S, Apolone G, Corli O, Montanari M, Fainsinger R, Aass N, Fayers P, Caraceni A, Klepstad P; European Palliative Care Research Collaborative; European Pharmacogenetic Study.Knudsen AK, et al. Among authors: klepstad p.Eur J Pain. 2011 Mar;15(3):320-7. doi: 10.1016/j.ejpain.2010.08.001. Epub 2010 Sep 6.Eur J Pain. 2011.PMID: 20822941