Is extensive screening for cancer in idiopathic venous thromboembolism warranted? - Van Doormaal FF; Terpstra W; Van Der Griend R; Prins MH; Nijziel MR; Van De Ree MA; Büller HR; Dutilh JC; ten Cate-Hoek A; Van Den Heiligenberg SM; Van Der Meer J; Otten JM (Journal of thrombosis and haemostasis : JTH, 2011)