[1] Azienda Osped Papa Giovanni XXIII, Bergamo, Italy
[2] Fdn IRCCS Policlin San Matteo, Pavia, Italy
[3] Med Univ Vienna, Div Hematol & Blood Coagulat, Dept Internal Med 1, Vienna, Austria
[4] San Bortolo Hosp, Vicenza, Italy
[5] Univ Padua, Padua, Italy
[6] Univ Florence, Florence, Italy
[7] Med Univ Vienna, Vienna, Austria
[8] Mayo Clin, Rochester, MN USA
[9] Univ Cologne, D-50931 Cologne, Germany
[10] Fdn Macchi, Div Hematol, Varese, Italy