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Checklist for the qualitative evaluation of clinical studies with particular focus on external validity and model validity

Gudrun Bornhöft* email, Stefanie Maxion-Bergemann* email, Ursula Wolf* email, Gunver S Kienle* email, Andreas Michalsen* email, Horst C Vollmar* email, Simon Gilbertson* email and Peter F Matthiessen* email

BMC Medical Research Methodology 2006, 6:56doi:10.1186/1471-2288-6-56

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