Comparison of subcutaneous low-molecular weight heparin with intravenous standard heparin in proximal deep-vein thrombosis - Prandoni, P; Lensing, A W A; Buller, H R; Carta, M; Cogo, A; Vigo, M; Casara, D; Ruol, A; ten Cate, J W (The Lancet, 1992)