[1] San Bortolo Hosp, Dept Hematol, Vicenza, Italy
[2] McMaster Univ, Hamilton, ON, Canada
[3] Univ Perugia, Dept Med, I-06100 Perugia, Italy
[4] Addenbrookes NHS Trust, Cambridge CB2 2QQ, England
[5] Univ Vermont, Dept Med, Colchester, VT USA
[6] Univ Vermont, Dept Pathol, Colchester, VT USA
[7] Med Univ Vienna, Dept Med 1, Vienna, Austria
[8] Univ Hosp S Orsola Malpighi, Dept Angiol & Blood Coagulat, Bologna, Italy
[9] Azienda Osped Careggi, Florence, Italy
[10] Royal Infirm, Dept Haematol, Glasgow G31 2ER, Lanark, Scotland