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D003075:Coitus; D004311:Double-Blind Method; D004791:Enzyme Inhibitors / Q000494:pharmacology / Q000627:therapeutic use*; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000503:physiopathology; D006801:Humans; D008297:Male; D010410:Penile Erection / Q000187:drug effects; D010879:Piperazines / Q000494:pharmacology / Q000627:therapeutic use*; D011687:Purines; D016032:Randomized Controlled Trials as Topic; D000068677:Sildenafil Citrate; D013450:Sulfones; D016896:Treatment Outcome
D004791:Enzyme Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate