DOI: 10.1055/s-00000089

Ultraschall in der Medizin - European Journal of Ultrasound

References

Howick J. Chalmers I. Glasziou P. et al.
The Oxford Levels of Evidence 2. OCEBM Levels of Evidence Working Group, Oxford Centre for Evidence-Based Medicine.
2009 Available from:
http://www.cebm.net/index.aspx?o=5653

Howick J, Chalmers I, Glasziou P et al.
The Oxford Levels of Evidence 2. OCEBM Levels of Evidence Working Group, Oxford Centre for Evidence-Based Medicine.
2009 Available from:
http://www.cebm.net/index.aspx?o=5653

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