a total of 161 infants and children , ranging in age from 1 day to 17 years at initial encounter ( mean , 3.7 years ) , was seen over a 30 year period with primary myocardial disease ( idiopathic myocarditis , nonobstructive cardiomyopathy , endocardial fibroelastosis , and an anatomically unknown category ) .
C0021270
infants
C0008059
children