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 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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