ArticlePain research & management

Re: Beaulieu AD, Peloso PM, Haraoui B, et al. Once-daily, controlled-release tramadol and sustained-release diclofenac relieve chronic pain to to osteoarthritis: a randomized controlled trial. Pain Res Manage 2008; 13:103-10, and Thorne C, Beaulieu AD, Callaghan DJ, et. al. A randomized, double-blind, crossover comparison of the efficacy and safety of oral controlled-release tramadol and placebo in patients with painful osteoarthritis. Pain Res Manage 2008; 13:93-102.

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