Clinical study designs and corresponding levels of evidence: time to redefine?

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@article{Buskens2015ClinicalSD, title={Clinical study designs and corresponding levels of evidence: time to redefine?}, author={Christianne Buskens}, journal={Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland}, year={2015}, volume={17 9}, pages={745-6} }