Antiviral and Antioxidant Activity of Flavonoids and Proanthocyanidins from Crataegus sinaica - Shahat, Abdelaaty A; Cos, Paul; De Bruyne, Tess; Apers, Sandra; Hammouda, Fayza M; Ismail, Shams I; Azzam, Safa; Claeys, Magda; Goovaerts, Etienne; Pieters, Luc; Vanden Berghe, Dirk; Vlietinck, Arnold J (Planta Medica, 2002)