Extended Myectomy for Hypertrophic Obstructive Cardiomyopathy after Failure or Contraindication of Septal Ablation or with Combined Surgical Procedures - Dörge, H; Schmitto, J D; Liakopoulos, O J; Walther, S; Schöndube, F A (The Thoracic and Cardiovascular Surgeon, 2004)