[1] Univ Athens, Laikon Gen Hosp, Dept Internal Med 1, Hematol Unit, Athens 11528, Greece
[2] G Gennimatas Dist Gen Hosp, Dept Clin Hematol, Athens, Greece
[3] Univ Athens, Dept Microbiol 3, Sch Med, Athens 11528, Greece
[4] Univ Athens, Sch Med, Dept Microbiol, Athens 11528, Greece
[5] Univ Athens, Laikon Gen Hosp, Dept Hematol, Athens 11528, Greece
[6] Univ Athens, Sch Phys Sci, Fac Biol, Athens 11528, Greece