[
1. Hu B, Guo H, Zhou P et al. Characteristics of SARS-CoV-2 and COVID-19. Nat Rev Microbiol. 2021, 19(3), 141-154.
]Search in Google Scholar
[
2. Ministry of Health. Open Data Portal. Statistics on COVID-19 distribution in Bulgaria. Available online at: https://data.egov.bg/data/view/492e8186-0d00-43fb-8f5e-f2b0b183b64f. /Accessed 4 Dec.,2021/.
]Search in Google Scholar
[
3. Doykov M, Stoyanov V, Trifonova K et al. Professional stress and burn-out syndrome among employees in University Hospital Kaspela. Trakia J Sci. 2021, 19, 4, 309-313.
]Search in Google Scholar
[
4. Almufarrij I, Munro KJ. One year on: an updated systematic review of SARS-CoV-2, COVID-19 and audio-vestibular symptoms. Int J Audiol. 2021, 60(12), 935-945.
]Search in Google Scholar
[
5. Mustafa MWM. Audiological profile of asymptomatic Covid-19 PCR-positive cases. Am J Otolaryngol. 2020, 41(3),102483.
]Search in Google Scholar
[
6. Munro KJ, Uus K, Almufarrij I et al. Persistent self-reported changes in hearing and tinnitus in post-hospitalisation COVID-19 cases. Int J Audiol. 2020, 59(12), 889-890.
]Search in Google Scholar
[
7. Piker EG, Jacobson GP. Self-report symptoms differ between younger and older dizzy patients. Otol Neurotol. 2014, 35(5), 873-9.
]Search in Google Scholar
[
8. Netland J, Meyerholz DK, Moore S et al. Severe acute respiratory syndrome coronavirus infection causes neuronal death in the absence of encephalitis in mice transgenic for human ACE2. J Virol, 2008, 82(15), 7264-75.
]Search in Google Scholar
[
9. Delgado-Roche L, Mesta F. Oxidative Stress as Key Player in Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) Infection. Arch Med Res, 2020, 51(5), 384-387.
]Search in Google Scholar
[
10. Ogier M, Andpol G, Sagui E et al. How to detect and track chronic neurologic sequelae of COVID-19? Use of auditory brainstem responses and neuroimaging for long-term patient follow-up. Brain Behav Immun Health, 2020, 5, 100081.
]Search in Google Scholar
[
11. Benghanem S, Mazeraud A, Azabou E et al. Brainstem dysfunction in critically ill patients. Critical Care, BioMed Central, 2020, 24 (1), 5.
]Search in Google Scholar