bibliographic entry 12080253 [be/12080253]
https://w3id.org/oc/corpus/be/12080253

is a

• bibliographic reference

content

• Centre for Evidence-Based Medicine. Levels of evidence. March 2009. www.cebm.net/oxford-centre-evidence-based-medicine-levels-evidence-march-2009/.

references

• https://w3id.org/oc/corpus/br/8074326