Thrombosis Centre, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy. Electronic address: polida@aou-careggi.toscana.it. Arianna Anticoagulazione Foundation, Bologna, Italy. Department of Cardiac Thoracic and Vascular Sciences, Thrombosis Centre, University of Padova, Italy. Haemostasis and Thrombosis Centre, Hospital of Cremona Italy. Humanitas Research Hospital, IRCCS Rozzano-Milano, Italy. Immunoematologia e Medicina Trasfusionale Azienda Ospedaliera Bolognini, ASST Bergamo Est, Seriate, Italy. Laboratorio Analisi (AOUI) Ospedale Civile Maggiore Di Borgo Trento, Verona, Italy. Centro TAO PO Cantù, ASST Lariana, Como, Italy. Poliambulatorio Specialistico Medical Pontino, Latina, Italy. Servizio Immunotrasfusionale Ospedale "Santa Caterina Novella", Galatina (Le), Italy. Centro per la prevenzione, diagnosi e trattamento delle malattie tromboemboliche- Asl 8- Cagliari, Italy. Ambulatorio Antitrombosi CAT-TAO AOU Pisana, Pisa, Italy. Institute of Cardiology and Center of Excellence on Aging - "G. d'Annunzio" University - Chieti, Italy.