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Table 3 Level of evidence

From: Multidisciplinary recommendations for diagnosis and treatment of foot problems in people with rheumatoid arthritis

  Evidence is based on
1 Research of level A1 or at least 2 independently conducted studies of level A2
2 1 study of level A2 or at least 2 independently conducted studies of level B
3 1 study of level B or C
4a Expert opinion described in the literature
4b Opinion of the expert group