title: 'Sildenafil and pharmaco-penile duplex ultrasonography' by Speel et al: inconclusive results.
authors.forename: A K
authors.initials: AK
authors.lastname: Slob
authors.forename: G R
authors.initials: GR
authors.lastname: Dohle
authors.forename: L
authors.initials: L
authors.lastname: Incrocci
mesh_terms: D018592:Cross-Over Studies; D006801:Humans; D008297:Male; D010413:Penis / Q000000981:diagnostic imaging* / Q000187:drug effects*; D010879:Piperazines / Q000494:pharmacology*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014463:Ultrasonography; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate