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 EvidenceBased Medicine.
Available from: 2009
http://www.cebm.net/index.aspx?o=5653
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