Double Hit Lymphoma Diagnosis and Treatment in Europe—A Cross-Sectional Survey of Clinical Practice by the EHA Lymphoma Working Party (EHA LyG). Issue 6 (20th December 2020) - Aurer, Igor; Dreyling, Martin; Federico, Massimo; Tilly, Herve; Linton, Kim; Kimby, Eva; Chamuleau, Martine E. D.; Kersten, Marie Jose