[1] Univ Hosp S Orsola Malpighi, Dept Angiol & Blood Coagulat M Golinelli, Bologna, Italy
[2] Azienda Osped Univ Careggi, Thrombosis Ctr, Dept Med Surg Crit Area, Florence, Italy
[3] Univ Padua, Dept Cardiothorac & Vasc Sci, Thromboembolism Unit, I-35100 Padua, Italy
[4] Univ Palermo, Dept Internal Med Cardiovascr & Nephrourol Dis, Hematol Unit, I-90133 Palermo, Italy
[5] Univ Auckland, Dept Mol Med & Pathol, Auckland 1, New Zealand
[6] McMaster Univ, Dept Med, Hamilton, ON, Canada