[1] Osped Fidenza Med Interna, Fidenza, Italy
[2] Univ Massachusetts, Med Ctr, Div Cardiovasc Med, Worcester, MA 01605 USA
[3] Hop Lariboisiere, Clin Therapeut, F-75475 Paris, France
[4] Hosp Germans Trias & Pujol, Barcelona, Spain
[5] Policlin San Matteo, IRCCS, Serv Malattie Tromboemboliche, I-27100 Pavia, Italy
[6] Univ Massachusetts, Sch Med, Worcester, MA 01605 USA