RT Journal Article SR Electronic T1 Review: low molecular weight heparin reduces recurrent venous thromboembolism better than unfractionated heparin JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 80 OP 80 DO 10.1136/ebm.10.3.80 VO 10 IS 3 YR 2005 UL http://ebm.bmj.com/content/10/3/80.abstract AB