- Have a history of deep vein thrombosis, pulmonary embolism, or any other significant venous thromboembolism (venous catheter thrombosis or superficial venous thrombosis not considered "significant") during the 3 months prior to study enrollment. Participants with venous thromboembolism occurring 3 to 6 months prior to study enrollment are allowed, if being treated with low molecular weight heparin.