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Randomised controlled comparison of the Health Survey Short Form (SF-12) and the Graded Chronic Pain Scale (GCPS) in telephone interviews versus self-administered questionnaires. Are the results equivalent?
Lungenhausen M, Lange S, Maier C, Schaub C, Trampisch HJ, Endres HG
BMC Med Res Methodol 2007, 7:50
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