TY - JOUR AU - Agnelli, G; Buller, H R; Cohen, A TI - Apixaban for extended treatment of venous thromboembolism JO - N Engl J Med IS - 08 VL - 368 PY - 2013 DO - 10.1056/NEJMoa1207541 L3 - PubMed-ID: 23216615 SP - 699 EP - 708 N1 - , et al; AMPLIFY-EXT Investigators. ER -