[1] Natl & Kapodistrian Univ Athens, Univ Gen Hosp Attikon, Med Sch, Dept Internal Med 4, Athens 12462, Greece
[2] Natl & Kapodistrian Univ Athens, Hippokrat Gen Hosp, Sch Med, Dept Internal Med 2, Athens 11527, Greece
[3] Sismanogleio Gen Hosp, Dept Internal Med 1, Athens 15126, Greece
[4] Natl & Kapodistrian Univ Athens, Sch Med, Dept Internal Med 2, Hematol Unit, Athens 11527, Greece
[5] Sismanogleio Gen Hosp, Dept Microbiol, Athens 15126, Greece
[6] Democritus Univ Thrace, Univ Hosp Alexandroupolis, Dept Internal Med 1, Alexandroupolis 68100, Greece
[7] Natl & Kapodistrian Univ Athens, Attikon Gen Univ Hosp, Med Sch, Dept Crit Care 2, Athens 12462, Greece
[8] Evangelismos Gen Hosp, Dept Internal Med, Athens 10676, Greece
[9] Natl & Kapodistrian Univ Athens, Med Sch, Dept Biol Chem, Athens 11527, Greece