PD-1 and PD-L1 Immunohistochemistry as a Diagnostic Tool for Classic Hodgkin Lymphoma in Small-volume Biopsies. (September 2021) - Uccella, Silvia; Magnoli, Francesca; Vivian, Lisa F.; Marchiori, Deborah; Leoni, Eleonora; Tibiletti, Maria G.; Sessa, Fausto