[1] Oncol Inst So Switzerland, Lymphoma Unit, Expt Oncol Lab, Bellinzona, Switzerland
[2] Amedeo Avogadro Univ Eastern Piedmont, Dept Clin Expt Med, Div Hematol, Novara, Italy
[3] CROINT, Div Pathol, Aviano, Italy
[4] Univ Cattolica Sacro Cuore, Inst Pathol, I-00168 Rome, Italy