Author/Authors :
Prakova, Gospodinka R. Department of Internal Medicine - Medical Faculty - Trakia University, Stara Zagora, Bulgaria , Gidikova, Pavlina L. Department of Hygiene Epidemiology and Infectious Diseases - Medical Faculty - Trakia University - Stara Zagora, Bulgaria , Sandeva, Gergana N. Department of Hygiene Epidemiology and Infectious Diseases - Medical Faculty - Trakia University - Stara Zagora, Bulgaria , Haracherova, Kamelia H. Occupational Medical Service "Zagora Medical" Ltd - Stara Zagora, Bulgaria , Tacheva, Tanya T. Department of Chemistry and Biochemistry - Medical Faculty - Trakia University, Stara Zagora, Bulgaria , Vlaykova, Tatyana I. Department of Chemistry and Biochemistry - Medical Faculty - Trakia University, Stara Zagora, Bulgaria
