Treatment of patients with proximal-vein thrombosis with intravenous unfractionated heparin in hospital compared with subcutaneous low-molecular-weight heparin out of hospital or with early discharge - Koopman, MMW; Prandoni, P; Piovella, F; Ockelford, PA; Brandjes, DP; Van der Meer, J; Gallus, AS; Simonneau, G; Chesterman, CH; Prins, MH (N Engl J Med, 1996)