Ventricular Arrhythmia at a Cardiopulmonary Exercise Test as Predictor for Severe Arrhythmic Events in Patients with Complex Congenital Heart Disease on 36 Months Follow-up - Ptushkina, S.; von Sanden, F.; Fritz, C.; Ewert, P.; Hager, A.; Wolf, C. (The Thoracic and Cardiovascular Surgeon, 2019)