A comparison of six weeks with six months of oral anticoagulant therapy after a first episode of venous thromboembolism - Schulman, S; Rhedin, A-S; Lindmarker, P; Carlsson, A; Lärfars, G; Nicol, P; Loogna, E; Svensson, E; Ljungberg, B; Walter, H; Viering, S; Nordlander, S; Leijd, B; Jönsson, K-Å; Hjorth, M; Linder, O; Boberg, J; and the duration of anticoagulation trial study group (N Engl J Med, 1995)