NPPB and myocarditis: At least one of the following: troponin levels elevated above hospital‐specific reference range,b BNP or NT‐proBNP level >400 pg/ml, ventricular dysfunction, mitral or aortic regurgitation, pericardial effusion, coronary artery aneurysm,c pericarditis or myocarditis, pulmonary edema due to left heart failure, arrhythmia, cardiac arrest, shock requiring vasopressors