1. Department of Onco-Haematology; Unit of Lymphoid Malignancies; Milan; Italy
2. Division of Haematology; Spedali Civili di Brescia; Brescia; Italy
3. Infectious Diseases Unit; San Raffaele Scientific Institute; Milan; Italy
4. Medical Oncology Unit; National Cancer Institute; Milan; Italy
5. Division of Medical Oncology A; National Cancer Institute; Aviano (PN); Italy