Six-year single-centre experience in minimally invasive mitral valve repair – impact of the team learning curve on in-hospital clinical outcome - Gerber, Witold; Sanetra, Krzysztof; Kuczera, Małgorzata; Białek, Krzysztof; Zembala, Marian; Cisowski, Marek (Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery, 2019)