title: WHO study of venous thrombosis and air travel.
mesh_terms: D000401:Aircraft; D005260:Female; D006801:Humans; D008297:Male; D016730:Program Development; D012106:Research / Q000458:organization & administration*; D018570:Risk Assessment; D014195:Travel; D020246:Venous Thrombosis / Q000209:etiology* / Q000517:prevention & control; D014944:World Health Organization