1. Institute of Histology and Embryology, University of Bologna, Bologna,
2. Division of Haematology, University of Florence, Florence,
3. Institute of Infectious Diseases, University of Bologna, Bologna,
4. Department of Genetics and Biology of Microorganisms, University of Milan, Milan,
5. University of Turin, Novara,
6. Institute of Clinical Medicine, University of Turin, Turin,
7. G. Prodi Interdepartmental Centre for Cancer Research, University of Bologna, Bologna, Italy