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Received July 5, 2017; revised manuscript received November 20, 2017; accepted December 26, 2017; released online February 3, 2018 Time for primary review: 28 days Department of Acute Cardiology (A.B., V.H., B.T., J.P.), Department of Cardiac Surgery (M.B.), The National Institute of Cardiovascular Diseases, Bratislava; Department of Faculty of Health, Catholic University, Ruzomberok (V.H.); Faculty of Medicine, Comenius University, Bratislava (P.M.), Slovakia Mailing address: Allan Böhm, MD, MBA, Department of Acute Cardiology, National Institute of Cardiovascular Diseases, Medena 18, Bratislava, Slovakia 81102. E-mail: allan.bohm@gmail.com ISSN-1346-9843 All rights are reserved to the Japanese Circulation Society. For permissions, please e-mail: cj@j-circ.or.jp Transcatheter Mitral Valve Prosthesis Dysfunction ― Early Valve Degeneration or Thrombosis? ―