DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

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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