Comparison of subcutaneous low-molecular-weight heparin with intravenous standard heparin in proximal deep-vein thrombosis - Prandoni, P; Lensing, AW; Büller, HR; Carta, M; Cogo, A; Vigo, M; Casara, D; Ruol, A; ten Cate, JW (Lancet, 1992)