1. Wells PS et al. Lancet 1995; 345:1326 2. Poulsen KA et al. Arthroscopy 1993; 9:570 3. Obernoster A. JAMA 1999; 282:431 4. Wells PS et al. N Engl J Med 2003; 349:1227 5. Huisman et al. Chest 1989; 95:498 6. Brabdjies et al. Lancet 1997; 349:759 7. Van den Belt AGM et al. In Cochrane Library, Issue 1. Oxford Software, 2002 8. Schraibbman IG et al. In Cochrane Library, Issue 1. Oxford Software, 2002 9. Ridker PM et al. Studio PREVENT. N Engl J Med 2003; 348:1425 10.Baglin T et al. Lancet 2003; 362: 523 11.Eichinger S et al. JAMA 2003 ; 290:1071. 12.Decousus H et al. N Engl J Med 1998; 338:409 13.Scottish Intercollegiate Guidelines Network: www.sign.ac.uk/fulltext/62/ 14.Studio PEP. Lancet 2000; 355:1288 15.Prandoni P et al. Ann Intern Med 2004;141:249 16.Fancher TL et al. BMJ 2004; 329:821-824 17.Rathbun SW et al. Ann Intern Med 2004; 141:839-845 18.Superficial Thrombophlebitis Treated By Enoxaparin Study Group. Arch Intern Med 2003 Jul 28; 163: 1657-63 19. Ost D et al. Duration of Anticoagulation Following Venous Thromboembolism. A Meta-analysis. JAMA 2005 Aug 10; 294:706-715. 20. Kyrle PA et al. The Risk of Recurrent Venous Thromboembolism in Men and Women. N Engl J Med 2004 Jun 17; 350: 2558-2563 21. McRae S et al. Effect of patient's sex on risk of recurrent venous thromboembolism: a meta-analysis. Lancet 2006, 368:371-378 22. Christiansen SC et al. Thrombophilia, Clinical Factors, and Recurrent Venous Thrombotic Events . JAMA. 2005;293:2352-2361. 23. Palareti G. for the PROLONG Investigators. D-Dimer Testing to Determine the Duration of Anticoagulation Therapy. N Engl J Med 2006 Oct 26; 355.1780-1789 24. Qaseem A et al. Current Diagnosis of Venous Thromboembolism in Primary Care: A Clinical Practice Guideline from the American Academy of Family Physicians and the American College of Physicians Ann Fam Med 2007 Jan/Feb;5:57-62. 25. Snow V et al. Management of Venous Thromboembolism: A Clinical Practice Guideline from the American College of Physicians and the American Academy of Family Physicians. Ann Intern Med 2007 Feb 6; 146: 204-240. 26. Di Nisio M et al. Treatment for superficial thrombophlebitis of the leg. Cochrane Database of Systematic Reviews. Volume 2, 2007. DOI: 10.1002/14651858.CD004982.pub3. John Wiley & Sons, Ltd