[1] Charite Med Univ Berlin, Berlin, Germany
[2] Dept Cardiac & Thorac Vasc Surg, Lubeck, Germany
[3] Goethe Univ, Inst Biostat & Math Modelling, Frankfurt, Germany
[4] Deutsch Gesell Thorax Herz & Gefasschirurg, Berlin, Germany
[5] Heart & Diabet Ctr North Rhine Westphalia, Bad Oeynhausen, Germany
[6] St Johannes Hosp Dortmund, Dortmand, Germany
[7] Goethe Univ Hosp Frankfurt, Frankfurt, Germany
[8] Univ Hosp Cologne, Cologne, Germany
[9] Univ Zurich, Berlin, Germany
[10] Univ Leipzig, Heart Ctr Leipzig, Leipzig, Germany
[11] Univ Med Ctr Schleswig Holstein Lubeck, Cologne, Germany
[12] Helios Klinikum Erfurt, Erfurt, Germany