Relationships of Recommendations 12 to 22 with primary treatment and secondary prevention phases of VTE treatment. Recommendations 12 to 14 address the duration of the primary treatment phase of therapy. Recommendations 15 to 17 address strategies to decide whether to discontinue anticoagulant therapy or continue with secondary prevention. Recommendations 18 to 22 address which patients should receive secondary prevention and with what antithrombotic therapies.