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This flowchart details the recruitment, selection, and classification of patients for the study, adhering to the Lake Louise Criteria 2018 for Cardiac Magnetic Resonance in Nonischemic Myocardial Inflammation (LLC2018) Guidelines. AMY‐pEF indicates acute myocarditis with preserved EF; AMY‐rEF, acute myocarditis with reduced EF; CMR, cardiovascular magnetic resonance; EF, ejection fraction; and FT, feature tracking.
