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National Library of Medicine accessed June 4, 2019 Effect of Testosterone on Response to Sildenafil in Men With Erectile Dysfunction 2012 157 Annals of Internal Medicine Konstantinos and Hatzimouratidis, Sildenafil in the Treatment of Erectile Dysfunction an Overview of the Clinical Evidence 2006 1 Clinical Interventions in Aging 403 Sildenafil MedlinePlus Drug Information MedlinePlus accessed June 4, 2019 WebMD Erectile Dysfunction Health Center - Find Impotence Information and Latest News on ED Treatments