[1] Sofiamed Univ Hosp, Dept Clin Hematol, Block 2,10 Dimitar Mollov Str, Sofia 1750, Bulgaria
[2] Natl Hematol Hosp, Lab Cytogenet & Mol Biol, Sofia, Bulgaria
[3] Med Univ Sofia, Alexandrovska Univ Hosp, Lab Clin Chem, Sofia, Bulgaria
[4] Med Univ Sofia, Alexandrovska Univ Hosp, Lab Clin Immunol, Sofia, Bulgaria
[5] Sofiamed Univ Hosp, Lab Clin Immunol, Sofia, Bulgaria