title: Cough headache and the competency of jugular venous valves.
authors.forename: V A
authors.initials: VA
authors.lastname: Knappertz
mesh_terms: D003371:Cough / Q000503:physiopathology*; D006261:Headache / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D007601:Jugular Veins / Q000000981:diagnostic imaging; D013577:Syndrome; D018615:Ultrasonography, Doppler, Color; D014636:Valsalva Maneuver; D014654:Vascular Patency