Assessment of the 4‐factor score: Retrospective analysis of 586 CLL patients receiving ibrutinib. A campus CLL study. Issue 5 (24th February 2021) - Morabito, Fortunato; Tripepi, Giovanni; Del Poeta, Giovanni; Mauro, Francesca Romana; Reda, Gianluigi; Sportoletti, Paolo; Laurenti, Luca; Coscia, Marta; Herishanu, Yair; Varettoni, Marzia; Murru, Roberta; Chiarenza, Annalisa; et al.