[1] Univ Salamanca, Dept Med, E-37008 Salamanca, Spain
[2] Pontificia Univ Catolica Chile, Fac Med, Santiago, Chile
[3] Hosp Univ Salamanca, Serv Hematol, Salamanca, Spain
[4] Hosp Clin Barcelona, Barcelona, Spain
[5] Hosp Virgen Blanen Leon, Leon, Spain
[6] Hosp Gen Segovia, Segovia, Spain