[1] Univ Cologne, Med Fac, Cologne, Germany
[2] Univ Cologne, Univ Hosp Cologne, Dep Internal Med 1, Cologne, Germany
[3] Univ Cologne, Ctr Integrated Oncol Aachen Bonn Cologne Dusseldor, Cologne, Germany
[4] Univ Cologne, German Hodgkin Study Grp GHSG, Cologne, Germany
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Pathol & Med Biol, Groningen, Netherlands
[6] Univ Hosp Cologne, Dept Nucl Med, Cologne, Germany
[7] Univ Cologne, Med Fac, Ctr Integrated Oncol Aachen Bonn Cologne Duesseldo, Dept Internal Med 1, Cologne, Germany
[8] Univ Hosp Cologne, Cologne, Germany
[9] Univ Cologne, Fac Med, Dept Gen Visceral Canc & Transplantat Surg, Cologne, Germany
[10] Univ Groningen, Univ Med Ctr Groningen, Dept Lab Med, Groningen, Netherlands
[11] Univ Groningen, Univ Med Ctr Groningen, Dept Hematol, Groningen, Netherlands