Corrigendum: Intrinsic and Extrinsic Properties Affecting Innate Immune Responses to Nanoparticles: The Case of Cerium Oxide - Casals, Eudald; Gusta, Muriel F.; Piella, Jordi; Casals, Gregori; Jiménez, Wladimiro; Puntes, Victor (Frontiers in Immunology, 2017)