Correction to: Comparison of Prognostic Scores in Patients With Hepatocellular Carcinoma Treated With Sorafenib. Issue 5 (27th May 2021) - Sansone, Vito; Tovoli, Francesco; Casadei-Gardini, Andrea; Di Costanzo, Giovan Giuseppe; Magini, Giulia; Sacco, Rodolfo; Pressiani, Tiziana; Trevisani, Franco; Rimini, Margherita; Tortora, Raffaella; Nardi, Elena; Ielasi, Luca; et al.