Levels of evidence according to the Oxford Centre for Evidence-Based Medicine 2009 classification system (from [18])
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![Levels of evidence according to the Oxford Centre for Evidence-Based Medicine 2009 classification system (from [18])](https://karger.silverchair-cdn.com/karger/content_public/journal/uin/105/3-4/10.1159_000510407/2/000510407_t02.png?Expires=1757228379&Signature=VXR99Wcy0Ao2Wawf7uIt9gAZ~4HaISps8DBkKV2LZMXDzeFFICZ0syOY4qdPB-k8dYN0O~cpMW8UBXcWjLA9lH06k735d-Xvewc6bVMfBYzpSk1OgJwqILlsnIRXvOPIRmA4sHnz2OhH0pcvXMkbBBoyxAMsCzvrf7p3HsdPgp1MwL2HcXoLfTg8W4PAU5I3dXMHJSW6F6MCEWMs-7NCe8FAEwPgQ54znoXovCq38pldoPzCANn-wGZUjEtyJOnWzcYPtsVOXrB8yb7vak~JWQ~kBaa3cXMUiK9CGHGvXZ--hlxNBlkPORjeUd1aF-EgyHtTuYmS5NQtpl2vbmo95Q__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
