Comparison of clinical and echocardiographic outcomes and quality of life in patients with severe mitral regurgitation treated by MitraClip implantation or treated conservatively - Krawczyk-Ożóg, Agata; Siudak, Zbigniew; Sorysz, Danuta; Hołda, Mateusz K.; Płotek, Anna; Dziewierz, Artur; Gackowski, Andrzej; Dudek, Dariusz (Advances in Interventional Cardiology/Postępy w Kardiologii Interwencyjnej, 2018)