Comparison of the Inhibitory Effects of Monomeric, Dimeric, and Trimeric Procyanidins on the Biochemical Markers of Skin Tumor Promotion in Mouse Epidermis in vivo - Gali, H U; Perchellet, E M; Gao, X M; Karchesy, J J; Perchellet, J P (Planta Medica, 1994)