Opioids for chronic noncancer pain: a meta-analysis of effectiveness and side effects.
Furlan AD; Sandoval JA; Mailis-Gagnon A; Tunks E; CMAJ: Canadian Medical Association Journal = Journal De L'association Medicale Canadienne, 2006, vol. 174, issue 11, p 1589, ISSN 14882329. ISBN 14882329.

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