1. Arianna Anticoagulazione Foundation; Bologna Italy
2. Angiology Unit; SS Filippo and Nicola Hospital; Avezzano L'Aquila Italy
3. Department of Internal Medicine; University of Insubria; Varese Italy
4. Cardiology Clinic; Thrombosis Centre; Department of Cardiac; Thoracic and Vascular Sciences; University of Padua; Padua Italy
5. Thrombosis Centre; AOU Careggi; Firenze Italy
6. Hemostasis and Thrombosis Center; Department of Laboratory Medicine; AO Istituti Ospitalieri; Cremona Italy
7. Hematology Department; S. Bortolo Hospital; Vicenza Italy
8. Department of Clinical Medicine; University of Padua; Padua Italy