Trained study nurses prospectively collected baseline demographics (age and gender), co-morbid conditions (active cancer, arterial hypertension, diabetes mellitus, acute or chronic heart failure, chronic pulmonary disease, cerebrovascular disease, chronic liver disease, chronic renal failure), history of VTE, type of PE (provoked versus cancer-related versus unprovoked), vital signs (mental status, heart rate, blood pressure, temperature, respiratory rate, and arterial oxygen saturation), routine laboratory findings (hemoglobin and serum creatinine), concomitant antiplatelet therapy and VTE-related treatment using standardized data collection forms.