[1] Univ Hosp Schleswig Holstein, Dept Med 2, Kiel, Germany
[2] Univ Hosp Ulm, Dept Med 3, Ulm, Germany
[3] Allgemeines Krankenhaus St Georg, Dept Hematol, Hamburg, Germany
[4] Univ Heidelberg Hosp, Dept Med 5, Heidelberg, Germany
[5] Univ Hosp Cologne, Dept Med 1, Cologne, Germany