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- [3] Influence of preceding length of anticoagulant treatment and initial presentation of venous thromboembolism on risk of recurrence after stopping treatment: analysis of individual participants? data from seven trials .2 Florent Boutitie,Laurent Pinede,Sam Schulman,Giancarlo Agnelli,Gary Raskob,Jim Julian,Jack Hirsh,Clive Kear. BMJ . 2011