title: Preoperative duplex imaging is required before all operations for primary varicose veins.
authors.forename: T A
authors.initials: TA
authors.lastname: Broek
mesh_terms: D006801:Humans; D011300:Preoperative Care / Q000295:instrumentation; D018616:Ultrasonography, Doppler, Duplex / Q000295:instrumentation*; D014648:Varicose Veins / Q000000981:diagnostic imaging*