1. Department of Special Surgery, Orthopedics, and Traumatology, Clinic of Vascular Surgery, Medical Faculty, Trakia University, 6000 Stara Zagora, Bulgaria
2. Department of General and Clinical Pathology, Forensic Medicine and Deontology and Dermatovenereology, Medical Faculty, Trakia University, 6000 Stara Zagora, Bulgaria
3. Department of Chemistry and Biochemistry, Medical Faculty, Trakia University, 6000 Stara Zagora, Bulgaria