Biomechanical engineering comparison of four leaflet repair techniques for mitral regurgitation using a novel 3-dimensional–printed left heart simulatorCentral MessagePerspective by Michael J. Paulsen, MD, Mateo Marin Cuartas, MD, Annabel Imbrie-Moore, MS, Hanjay Wang, MD, Robert Wilkerson, BS, Justin Farry, BSE, Yuanjia Zhu, MD, Michael Ma, MD, John W. MacArthur, MD, Y. Joseph Woo, MD

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