1. Division of Hematology/Oncology, Department of Internal Medicine; American University of Beirut Medical Center; Beirut Lebanon
2. Department of Internal Medicine; Emory University School of Medicine; Atlanta Georgia
3. Department of Internal Medicine; Foundation of the Scientific Institute for Research, Hospitalization, and Health Care (IRCCS), Ca' Granda Ospedale Maggiore Polyclinic; Milan Italy
4. Department of Clinical Sciences and Community Health; University of Milan; Milan Italy