1. Oncohematology Division; IRCCS Ca' Granda-Maggiore Policlinico Hospital Foundation, and Department of Oncology and Onco-Hematology, University of Milan; Milan Italy
2. Division of Pathology; Department of Pathophysiology and Transplantation, University of Milan, and IRCCS Ca' Granda-Maggiore Policlinico Hospital Foundation; Milan Italy
3. Institute of Pathology, University of Cologne; Cologne Germany
4. Department of Pathology and Laboratory Medicine; Weill Cornell Medical College/New York Presbyterian Hospital; New York New York