Adolescent / Echocardiography / Humans / Child / Female / Male / Infant / Newborn Infant / Aged / Middle Aged / Spectrum / Heart valves / Adult / Myocardium / Public health systems and services research / Heart Ventricles / The American / Male / Infant / Newborn Infant / Aged / Middle Aged / Spectrum / Heart valves / Adult / Myocardium / Public health systems and services research / Heart Ventricles / The American