Table 1.

Scientific rationale of consensus statements^a

Definitions related to a treatment or procedure	Consensus statement instruction	Symbol
Supported by strong observational evidence and authors’ consensus	‘Should do this’
Some evidence and general agreement favour the usefulness/efficacy of a test	‘May do this’
There is evidence or general agreement not to recommend a test	‘Do not do this’

^aThe categorization for our consensus document should not be considered directly similar to the one used for official society guideline recommendations which apply a classification (I–III) and level of evidence (A, B, and C) to recommendations.