RT Journal Article SR Electronic T1 Ximelagatran prevented secondary venous thromboembolism JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 107 OP 107 DO 10.1136/ebm.9.4.107 VO 9 IS 4 YR 2004 UL http://ebm.bmj.com/content/9/4/107.abstract AB