Ayako Akita, Yi Sun and Ken Yasukawa 2015. Inhibitory Effects of Chaga (Inonotus Obliquus) on Tumor Promotion in Two-Stage Mouse Skin Carcinogenesis. Journal of Pharmacy and Nutrition Sciences . 5, 1 (Jan. 2015), 71–76. DOI:https://doi.org/10.6000/1927-5951.2015.05.01.11.