Distinctive natural history in hepatitis C virus positive diffuse large B-cell lymphoma: analysis of 156 patients from northern Italy. - Visco C; Arcaini L; Brusamolino E; Burcheri S; Ambrosetti A; Merli M; Bonoldi E; Chilosi M; Viglio A; Lazzarino M; Pizzolo G; Rodeghiero F (Annals of oncology : official journal of the European Society for Medical Oncology, 2006)