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Vardenafil increases penile rigidity and tumescence in erectile dysfunction patients: a RigiScan and pharmacokinetic study[J] . T. Klotz,R. Sachse,A. Heidrich,F. Jockenh?vel,G. Rohde,G. Wensing,R. Horstmann,R. Engelmann.World Journal of Urology . 2001 (1)