DOI:
10.1055/s-00000001
AINS - Anästhesiologie · Intensivmedizin · Notfallmedizin · Schmerztherapie
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References
Oxford Centre for Evidenced Based Medicine – Levels of Evidence (March 2009).
Im Internet:
http://www.cebm.net/oxford-centre-evidence-based-medicine-levels-evidence-march-2009/ Stand 05.05.2015
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