Invasive versus echocardiographic gradients in degenerated surgical aortic valve prostheses: A multicenter studyCentral MessagePerspective by Amer N. Kadri, MD, George Hanzel, MD, Sammy Elmariah, MD, Francis Shannon, MD, Karim Al-Azizi, MD, Judith Boura, MS, Michael Mack, MD, Amr E. Abbas, MD

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