echocardiography: congenital shunt flow across atrioventricular canal bidirectional
echocardiography: congenital shunt flow across atrioventricular canal bidirectional
echocardiography: congenital shunt flow across atrioventricular canal bidirectional (procedure)
echocardiography: congenital shunt flow across atrioventricular canal bidirectional (procedure)