title: Editorial comment.
authors.forename: Ronald W
authors.initials: RW
authors.lastname: Lewis
mesh_terms: D007172:Erectile Dysfunction / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010413:Penis / Q000098:blood supply* / Q000000981:diagnostic imaging*; D012039:Regional Blood Flow; D013997:Time Factors; D018608:Ultrasonography, Doppler