Affiliation: | 1. Department of Hematology, West German Cancer Center, University Hospital Essen, University of Duisburg‐Essen, Essen, Germany;2. Department of Medicine II, Saarland University Medical Center, Saarland University, Homburg, Germany;3. Rheinisch‐Westf?lisches Institut für Wirtschaftsforschung, Essen, Germany |