<qa>  What is the risk reduction of DVT and PE recurrence?- Treatment of deep vein thrombosis DVT, pulmonary embolism PE, and risk reduction of DVT and PE recurrence; 15 mg BID for 3 weeks then 20 mg OD: different departments of the hospital will be in charge of the sample collection samples can come e.g., from emergency room, vascular lab or cancer unit. 