Corrigendum: Clinical and Research Activities at the CATANA Facility of INFN-LNS: From the Conventional Hadrontherapy to the Laser-Driven Approach - Cirrone, Giuseppe A. P.; Cuttone, Giacomo; Raffaele, Luigi; Salamone, Vincenzo; Avitabile, Teresio; Privitera, Giuseppe; Spatola, Corrado; Amico, Antonio G.; Larosa, Giuseppina; Leanza, Renata; Margarone, Daniele; Milluzzo, Giuliana; et al. (Frontiers in Oncology, 2017)