Protein C deficiency in a controlled series of unselected out-patients:an infrequent but clear risk factor for venous thrombosis Leiden thrombophilia Study (LETS) - Koster, T; Rosendaal, F R; Briët, E; van der Meer, F J M; Colly, L P; Trienekens, P H; Poort, S R; Vandenbroucke, J P (Blood, 1995)
in press