In Vivo Antioxidant Action of a Lignan-Enriched Extract of Schisandra Fruit and an Anthraquinone-Containing Extract of Polygonum Root in Comparison with Schisandrin B and Emodin - Chiu, P Y; Mak, D H F; Poon, M K T; Ko, K M (Planta Medica, 2002)