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R. J. Willke, L. B. Burke and P. Erickson, “Measuring Treatment Impact: A Review of Patient-Reported Outcomes and Other Efficacy Endpoints in Approved Product Labels,” Controlled Clinical Trials, Vol. 25, No. 6, 2004, pp. 535-552. http://dx.doi.org/10.1016/j.cct.2004.09.003

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