[1] Univ Bonn, Dept Internal Med 1, Bonn, Germany
[2] Univ Hosp Essen, Dept Gen Visceral & Transplantat Med, Essen, Germany
[3] Univ Hosp Essen, Dept Gen Visceral & Transplantat Surg, Essen, Germany
[4] Univ Hamburg, Dept Internal Med, Hamburg, Germany
[5] Goethe Univ Frankfurt, Dept Internal Med, D-60054 Frankfurt, Germany
[6] Univ Regensburg, Dept Internal Med 1, D-93053 Regensburg, Germany
[7] Heidelberg Univ, Dept Internal Med, Heidelberg, Germany
[8] Johannes Gutenberg Univ Mainz, Dept Internal Med, Mainz, Germany
[9] Hannover Med Sch, Dept Immunol & Rheumatol, Hannover, Germany
[10] Univ Tubingen, Dept Internal Med, Sch Med, Tubingen, Germany
[11] Univ Bonn, Dept Surg, Bonn, Germany