Stairway to Heaven: Evaluation of Cardiorespiratory Fitness with a Simple Standardized Stair Climbing Test in Comparison to Standard Treadmill Cardiopulmonary Exercise Testing and 6-Minute Walking Test - Uhl, M.; Huber, K. V.; Haas, N. A.; Dold, S. K. (The Thoracic and Cardiovascular Surgeon, 2023)