Interaction study between digoxin and a preparation of hawthorn (Crataegus oxyacantha). - Tankanow,R.; Tamer,H.R.; Streetman,D.S.; Smith,S.G.; Welton,J.L.; Annesley,T.; Aaronson,K.D.; Bleske,B.E. (J Clin Pharmacol, 2003)