Discrete Subaortic Stenosis: Long-Term Prognosis on the Progression of the Obstruction and of the Aortic Insufficiency - Stassano, P; Di Tommaso, L; Contaldo, A; Monaco, M; Mottola, M; Musumeci, A; Coronella, G; Spampinato, N (The Thoracic and Cardiovascular Surgeon, 2005)