echocardiography: great arteries vascular ring encircling trachea and esophagus
echocardiography: great arteries vascular ring encircling trachea and esophagus
echocardiography: great arteries vascular ring encircling trachea and esophagus (procedure)
echocardiography: great arteries vascular ring encircling trachea and esophagus (procedure)