Pulmonary embolism as a first clinical sign of occult malignancy: A prospective follow-up study - van der Heiden, Pirn L. J.; Prins, Martin H.; de Monyé, Wouter; van Strijen, Marco L. J.; Banga, Jan Dirk; Postmus, Piet E.; ten Wolde, Marije; Büller, Harry R.; Brandjes, Desiderius P. M.; Huisman, Menno V.; on behalf of the ANTELOPE study group (Thrombosis and Haemostasis, 2006)