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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?

Margitta Lungenhausen email, Stefan Lange email, Christoph Maier email, Claudia Schaub email, Hans J Trampisch email and Heinz G Endres email

BMC Medical Research Methodology 2007, 7:50doi:10.1186/1471-2288-7-50

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