Authors
D. Petrova
MHAT Heart and Brain – Pleven, Bulgaria
T. Vekov
MHAT Heart and Brain – Pleven, Bulgaria
Medical University – Pleven, Bulgaria
A. Georgiev
MHAT Heart and Brain – Pleven, Bulgaria
V. Danov
MHAT Heart and Brain – Pleven, Bulgaria
Medical University – Pleven, Bulgaria
University Ruse „Angel Kanchev“ – Ruse, Bulgaria
