RT Journal Article SR Electronic T1 Duration of anticoagulation after first episode of unprovoked venous thromboembolism JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1776 OP 1777 VO 25 IS 11 A1 Abdel-Razeq, Hikmat N. A1 Radwi, Ghazala R. A1 Farraj, Rami S. YR 2004 UL http://smj.org.sa/content/25/11/1776.abstract AB