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Erectile dysfunctionErectile DysfunctionErectile dysfunction.Oral Sildenafil in the Treatment of Erectile DysfunctionOral Sildenafil in the Treatment of Erectile DysfunctionOral Sildenafil in the Treatment of Erectile DysfunctionOral Sildenafil in the Treatment of Erectile DysfunctionIncidence of erectile dysfunction in men 40 to 69 years old: longitudinal results from the Massachusetts male aging studyPrediction of cardiovascular events and all-cause mortality with erectile dysfunction: a systematic review and meta-analysis of coho...The international index of erectile function (IIEF): a multidimensional scale for assessment of erectile dysfunction