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Graf, J., Janssens, U. (2007). The good, the bad, and the ugly — Qualitätsmerkmale publizierter Studien. In: Evidenzbasierte Medizin in Anästhesie und Intensivmedizin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-29946-2_2
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