Level 1	Level 2	Level 3
Levels of recommendation of CMR/CCT in CHD
Definition	Cooperative Adolescent/adult patients with simple/moderate CHD that require additional cross-sectional imaging investigation	Cooperative patients with moderate/complex CHD candidate to longitudinal cross-sectional imaging evaluation	Uncooperative patients and complex CHD proposed for “optional” and technically difficult cross-sectional imaging investigation in potentially unsafe scanning condition
Refer to	Any center with cardiovascular imaging experience	Specialized center with experience in the diagnosis and treatment of CHD	Tertiary center with long-standing experience in the diagnosis and treatment of CHD