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 CaCa' Granda Ospedale Maggiore Polyclinic, Milan, Italy.
4 Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.