title: Preoperative duplex imaging is required before all operations for primary varicose veins.
authors.forename: B C
authors.initials: BC
authors.lastname: Vrouenraets
authors.forename: J N
authors.initials: JN
authors.lastname: Keeman
mesh_terms: D003657:Decision Making; D006801:Humans; D011300:Preoperative Care / Q000295:instrumentation; D012501:Saphenous Vein / Q000000981:diagnostic imaging; D012680:Sensitivity and Specificity; D018616:Ultrasonography, Doppler, Duplex / Q000295:instrumentation*; D014648:Varicose Veins / Q000000981:diagnostic imaging*