title: Systematic review of Viagra RCTs.
authors.forename: Marco H
authors.initials: MH
authors.lastname: Blanker
authors.forename: Siep
authors.initials: S
authors.lastname: Thomas
authors.forename: Arthur M
authors.initials: AM
authors.lastname: Bohnen
mesh_terms: D015982:Bias; D006801:Humans; D018783:Impotence, Vasculogenic / Q000188:drug therapy*; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use*; D010879:Piperazines / Q000627:therapeutic use*; D011687:Purines; D012196:Review Literature as Topic; D000068677:Sildenafil Citrate; D013450:Sulfones; D016896:Treatment Outcome
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate