Efficacy and safety of <scp>twice‐daily</scp> tramadol hydrochloride bilayer <scp>sustained‐release</scp> tablets with an immediate release component for postherpetic neuralgia: Results of a Phase <scp>III</scp>, randomized, <scp>double‐blind</scp>, <scp>placebo‐controlled</scp>, <scp>treatment‐withdrawal</scp> study
Pain practice