Heparin and low-molecular-weight heparin. Mechanisms of action, pharmacokinetics, dosing, monitoring, efficacy, and safety - Hirsch, J; Warkentin, TE; Shanghnessy, SG; Anand, SS; Halperin, JI; Raschke, R; Granger, C; Ohman, EM; Dalen, JE (CHEST, 2000)