1Hassson PO, Wefin L, Tibbfin G. Deep vein thrombosis and pulmonary embolism in the general population. The study of Men Born in 1913. Arch Intern Med, 1997, 157 ( 15 ) : 1665.
2Ramaswami G , Nicolaides AN. Cost. Effectiveness of mechanical from of DVT prophylaxis in general surgery, later Augiol, 1996, 15 ( suppl) :21.