[1] Aristotle Univ Thessaloniki, Med Sch, Dept Microbiol 1, Thessaloniki 54124, Greece
[2] Aristotle Univ Thessaloniki, AHEPA Hosp, Dept Paediat 2, Children & Adolescent Haematol Oncol Unit, Thessaloniki 53646, Greece
[3] Childrens Hosp MITERA, Paediat & Adolescent Oncol Clin, Athens 15123, Greece
[4] PA Kyriakou Childrens Hosp, Oncol Dept, Athens 11527, Greece
[5] Aghia Sophia Childrens Hosp, Dept Paediat Haematol Oncol, Athens 11527, Greece
[6] Natl & Kapodistrian Univ Athens, Aghia Sophia Childrens Hosp, Dept Paediat 1, Paediat Haematol Oncol Unit, Athens 11527, Greece
[7] Hippokrateion Hosp, Dept Paediat Haematol & Oncol, Thessaloniki 54642, Greece
[8] Univ Crete, Paediat Haematol Oncol Dept, Iraklion 70013, Greece
[9] Aghia Sophia Childrens Hosp, Stem Cell Transplant Unit, Athens 11527, Greece