RT Journal Article SR Electronic T1 Review: flight times >8 hours and presence of risk factors for VTE increases travel related VTE JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 105 OP 105 DO 10.1136/ebm.12.4.105 VO 12 IS 4 YR 2007 UL http://ebm.bmj.com/content/12/4/105.abstract AB