“…The following search terms were used: 'treatment', 'extended treatment', 'continued treatment', 'rivaroxaban', 'Xarelto', 'dabigatran', 'Pradaxa', 'apixaban', 'Eliquis', 'vitamin K antagonist', 'warfarin', 'placebo', 'direct Xa inhibitor', 'direct thrombin inhibitor', 'oral anticoagulant', 'venous thromboembolism', 'deep venous thromboembolism' and 'pulmonaryembolism'. In Pubmed, the "Cochrane highly sensitive search filter for randomized clinical trials" was used[10]. In Embase search words for clinical trials were used with inspiration from the Cochrane…”