This risk calculator is based on "Risk assessment model to predict recurrence in patients with unprovoked deep vein thrombosis or pulmonary embolism" by Sabine Eichinger, MD; Georg Heinze, PhD; Lisanne M. Jandeck, MSc; Paul A. Kyrle, MD

It was optimized for use with Mozilla Firefox and Microsoft IE.
Developed at Center for Medical Statistics Informatics and Intelligent Systems, Medical University of Vienna, Austria.