1 Department of Cardiovascular Surgery, Hospital Clínic de Barcelona, University of Barcelona, Barcelona, Spain.
2 Cardiovascular Surgery Division, Mayo Clinic Rochester, Rochester, MN, USA.
3 Cardiac Surgery Department, Pauls Stradiņš Clinical University Hospital, Riga, Latvia.
4 Department of Cardiothoracic Surgery and The Robert WM Frater Cardiovascular Research Centre, University of the Free State, Bloemfontein, South Africa.