Effect of fruit juice intake on urinary quercetin excretion and biomarkers of antioxidative status. - Young,J.F.; Nielsen,S.E.; Haraldsdottir,J.; Daneshvar,B.; Lauridsen,S.T.; Knuthsen,P.; Crozier,A.; Sandstrom,B.; Dragsted,L.O. (Am J Clin Nutr, 1999)