Corrigendum to "Proopiomelanocortin gene delivery induces apoptosis in melanoma through NADPH oxidase 4-mediated ROS generation" [Free Radic. Biol. Med. 70 (2014) 14-22]. - Liu GS; Wu JC; Tsai HE; Dusting GJ; Chan EC; Wu CS; Tai MH (Free radical biology & medicine, 2021)