DOI:
10.1055/s-00028422
Ultrasound International Open
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References
Howick J, Chalmers I, Glasziou P, Greenhalgh T, Heneghan C, Liberati A, Moschetti I. et al.
The 2011 Oxford CEBM Levels of Evidence (Introductory Document).
In.
Oxford: Oxford Centre for Evidence-Based Medicine; 2011
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