Section outline

  • This ranking is particularly relevant if the literature found is inconsistent. The various types of studies listed in Figure 1 will briefly be introduced in the following paragraphs. For further information, refer to the literature listed under ‘further reading’.  

    Rankings levels of evidence: meta-analysis having the highest level of evidence and editorials and expert on the lowest

    Figure 1. Various levels of evidence and their rankings; meta-analysis having the highest level of evidence and editorials and expert opinions the lowest.

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