1. Division of Hematology, Department of Hematology Oncology, University of Pavia & Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
2. Department of Hematology, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
3. UF di Ematologia, Dip. Area Critica Medico-Chirugica, Università di Firenze; Istituto Toscano Tumori, Firenze, Italy
4. Division of Hematology, Ospedale Niguarda Ca' Granda, Milan, Italy
5. Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN