Low doses of aspirin reduce by 40% the recurrence of venous thrombosis and pulmonary embolism, affecting 130,000 people every year in Italy, with a high mortality rate (30,000 per year) and an equally high incidence of disability through the post-phlebitis syndrome (ulcers, varicose veins). To demonstrate the effectiveness of aspirin is a study on the New England Journal of Medicine conducted by Cecilia Becattini and Giancarlo Agnelli, of the University of Perugia.