1. Haematoncology Division; European Institute of Oncology; Milan Italy
2. Pathology Division; European Institute of Oncology; Milan Italy
3. Mayo Clinic; Rochester MN USA
4. Epidemiology and Biostatistics Department; European Institute of Oncology; Milan Italy
5. Medical University; Vienna Austria
6. Sun Yat-Sen University Cancer Center; Guangzhou China
7. Policlinico Sant'Orsola; Bologna Italy
8. Pathologisches Institut der Universität; Würzburg Germany
9. IOSI; Bellinzona Switzerland