[1] Univ Athens, Laiko Hosp, Sch Med, Dept Propaedeut Med 1, Athens 11521, Greece
[2] Univ Athens, Attikon Univ Hosp, Sch Med, Dept Propaedeut Med 2, Athens, Greece
[3] Univ Ioannina, Dept Chem, Biochem Lab, GR-45110 Ioannina, Greece
[4] Laiko Hosp, Reg Blood Transfus Ctr 2, Athens, Greece
[5] Laiko Hosp, Haemostasis Unit, Athens, Greece