title: Life begins at forty.
authors.forename: Thomas
authors.initials: T
authors.lastname: Fekete
mesh_terms: D000328:Adult; D007172:Erectile Dysfunction / Q000188:drug therapy*; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use*; D012107:Research Design; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology; D014665:Vasodilator Agents / Q000627:therapeutic use*
chemical_list: D010726:Phosphodiesterase Inhibitors; D014665:Vasodilator Agents