[1] Univ Rostock, Fak Med, Dept Cardiac Surg, D-18057 Rostock, Germany
[2] Univ Rostock, Fak Med, Dept Cardiac Surg, D-18057 Rostock, Germany
[3] Univ Rostock, Fac Med, Dept Pediat Cardiol, D-18057 Rostock, Germany
[4] Univ Rostock, Fac Med, Dept Anesthesiol, D-18057 Rostock, Germany