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General medicine
Inclusion and exclusion criteria and the problem of describing homogeneity of study populations in clinical trials

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Footnotes

  • Contributors All authors contributed substantially to the paper. FW and FP were primarily responsible for the acquisition of the data, but all authors contributed substantially into the analysis and review of the data, the development of the report and editing of the paper for submission.

  • Competing interests None declared.

  • Ethics approval This study includes only published information that cannot be related to individual subjects.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement The results on the remaining six criteria are available (in German language) through FW and FP. We are planning additional publications on these papers.