Selective Inhibition of COX-2 by a Standardized CO2 Extract of Humulus lupulus in vitro and its Activity in a Mouse Model of Zymosan-Induced Arthritis - Hougee, Sander; Faber, Joyce; Sanders, Annemarie; Berg, Wim B van den; Garssen, Johan; Smit, H Friso; Hoijer, Maarten A (Planta Medica, 2006)