[1] Univ Hosp Cologne, Dept Internal Med 1, Cologne, Germany
[2] Univ Hosp Cologne, GHSG, Cologne, Germany
[3] German Hodgkin Study Grp, Cologne, Germany
[4] Univ Tubingen, Hematol & Oncol, Tubingen, Germany
[5] Univ Hosp, Dept Internal Med 3, Munich, Germany
[6] Univ Heidelberg Hosp, Dept Hematol, Heidelberg, Germany
[7] Max Delbruck Ctr Mol Med, Berlin, Germany
[8] Univ Hosp Cologne, Dept Nucl Med, Cologne, Germany
[9] Univ Cologne, Dept Internal Med 1, GHSG, D-50931 Cologne, Germany