Sarah Gillessen1, Carsten Kobe2, Andreas Engert1, Bastian von Tresckow1. 1. German Hodgkin Study Group, Department I of Internal Medicine, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany. 2. German Hodgkin Study Group, Department of Nuclear Medicine, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany.