[1] Royal Brompton & Harefield NHS Fdn Trust, Dept Cardiothorac Transplantat & Mech Circulatory, London, England
[2] Heidelberg Univ, Heart & Marfan Ctr, Dept Cardiac Surg, Heidelberg, Germany
[3] Charite, Dept Cardiovasc Surg, Berlin, Germany
[4] Univ Free State, Dept Cardiothorac Surg, Bloemfontein, South Africa