1. Department of Hematology and OncologyKantonsspital Graubünden Chur Switzerland
2. Department of Hematology and OncologyUniversity Medical CenterGeorg‐August University Göttingen Germany
3. Statistics and EpidemiologyInstitute for Medical InformaticsUniversity of Leipzig Leipzig Germany
4. Comprehensive Cancer Center UlmInstitute of Experimental Cancer ResearchUniversity Hospital Ulm Ulm Germany
5. Department of Internal MedicineUniversity Hospital Saarland Homburg Germany