DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Howick J, Chalmers I, Glasziou P. et al
The 2011 Oxford CEBM evidence levels of evidence (introductory document).
Oxford Center for Evidence Based Medicine 2011.
https://www.cebm.ox.ac.uk/resources/levels-of-evidence/ocebm-levels-of-evidence
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