Erratum to: Palmitoylethanolamide and luteolin ameliorate development of arthritis caused by injection of collagen type II in mice. Issue 1 (December 2016) - Impellizzeri, Daniela; Esposito, Emanuela; Di Paola, Rosanna; Ahmad, Akbar; Campolo, Michela; Peli, Angelo; Morittu, Valeria; Britti, Domenico; Cuzzocrea, Salvatore