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Table 2 Grading of recommendations depending on their level of evidence

From: Proposed guidelines for the diagnosis and management of methylmalonic and propionic acidemia

Grade of recommendation

Criteria

A

If level 1 evidence was found (not the case in this study).

B

If level 2 evidence was found.

C

If level 3 evidence was found (mainly non-analytical studies such as case reports and case series).

D

If level 4 evidence was found (mainly expert opinion).