Volume 45, Issue 4, Pages 499-509 (April 2004) A Multicenter, Randomized, Double-Blind, Crossover Study to Evaluate Patient Preference between Tadalafil and Sildenafil  Alexander von Keitz, Jacob Rajfer, Scott Segal, Aileen Murphy, Jonathan Denne, Timothy Costigan, Daniel Lockhart, Charles M. Beasley, Jeffrey T. Emmick  European Urology  Volume 45, Issue 4, Pages 499-509 (April 2004) DOI: 10.1016/j.eururo.2003.11.030

Fig. 1 Study design illustrating treatment periods. European Urology 2004 45, 499-509DOI: (10.1016/j.eururo.2003.11.030)

Fig. 2 Dosing instructions. European Urology 2004 45, 499-509DOI: (10.1016/j.eururo.2003.11.030)

Fig. 3 Patient progress through the study. European Urology 2004 45, 499-509DOI: (10.1016/j.eururo.2003.11.030)

Fig. 4 Patient preference for sildenafil vs. tadalafil overall and by comorbidities, prior sildenafil use, and sildenafil titration status. European Urology 2004 45, 499-509DOI: (10.1016/j.eururo.2003.11.030)