[1] Papworth Hosp NHS Fdn Trust, Dept Cardiothorac Surg, Cambridge CB23 3RE, England
[2] Inselspital Bern, Univ Hosp Bern, Div Gen Thorac Surg, Bern, Switzerland
[3] Univ Turin, Dept Cardiovasc & Thorac Surg, Turin, Italy
[4] San Giovanni Battista Hosp, Citta Salute & Sci, Turin, Italy
[5] Glenfield Hosp, Dept Thorac Surg, Leicester, Leics, England
[6] Univ Iceland, Landspitali Univ Hosp, Dept Cardiothorac Surg, Reykjavik, Iceland
[7] Univ Iceland, Fac Med, Reykjavik, Iceland
[8] Hosp Cruz Vermelha, Unit Cardiac Surg, Lisbon, Portugal
[9] Odense Univ Hosp, Dept Cardiothorac Surg, Clin Guidelines Comm, Odense, Denmark
[10] James Cook Univ Hosp, Dept Cardiothorac Surg, Middlesbrough, Cleveland, England
[11] Lazzaro Spallanzani Hosp, Unit Thorac Surg, Azienda Osped S Camillo Forlanini, EACTS Thorac Domain, Rome, Italy