1. Angiology and Blood Coagulation, University Hospital of Bologna, Bologna, Italy;
2. Thrombosis Centre, Department Heart and Vessels, University Hospital of Florence, Florence, Italy;
3. Haemostasis and Thrombosis Centre, Hospital of Lecco, Lecco, Italy;
4. Internal Medicine, ASMN-IRCCS-Reggio Emilia, Reggio nell'Emilia, Italy;
5. Haemostasis and Thrombosis Centre, Hospital of Cremona, Cremona, Italy;
6. Haematology and Thrombosis Centre, Hospital of Vicenza, Vicenza, Italy; and
7. Department of Cardiothoracic and Vascular Sciences and
8. Internal Medicine, Department of Medical and Surgical Sciences, University Hospital of Padua, Padua, Italy