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Task Force for Cancer Pain Management; Guevara-López U, Govarrubias-Gómez A, Ochoa-Carrillo FJ, Fernández-Orozco A, Bernal-Sahagún F.Task Force for Cancer Pain Management, et al.Cir Cir. 2006 Sep-Oct;74(5):381-96.Cir Cir. 2006.PMID: 17224111Spanish.