[1] Laikon Gen Hosp, Blood Ctr, Agiou Thoma 17, Athens 11527, Greece
[2] Laikon Gen Hosp, Natl Ctr Congenital Bleeding Disorders, Agiou Thoma 17, Athens 11527, Greece
[3] Hellen Open Univ, Fac Social Sci, Dept Hlth Management, Patras, Greece
[4] Univ Athens, Med Sch, Athens, Greece