“Inhibitory Effect of a Combined Treatment of Glycyrrhizin and Caffeine on Tumor Promotion by 12-O-Tetradecanoylphorbol-13-Acetate in Two-Stage Carcinogenesis in Mouse Skin” (2013) Journal of Pharmacy and Nutrition Sciences, 3(3), pp. 202–205. doi:10.6000/1927-5951.2013.03.03.4.