Congenital heart disease involving the aortic valve: four cases treated by direct-vision surgery.
D001021:Aortic Valve / Q000002:abnormalities*; D006330:Heart Defects, Congenital; D006801:Humans; D008499:Medical Records; D008910:Minnesota
AORTIC VALVE/abnormalities; HEART DEFECTS, CONGENITAL/case reports