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Table 2 EBRO classification of methodological quality of individual studies [18]

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

A1 Systematic review of at least two independent studies of A2-level
A2 Randomized double-blind controlled clinical trial of good quality and of sufficient size
B Controlled trial but not with all the characteristics as mentioned under A2
C Non-controlled studies
D Expert opinion