Table 5.

Research concepts and hot topics.

Cluster	Concept	Nodes (n=62)
1	COVID-19	ACE2, brain, CNS, COVID-19, cytokine storm, encephalitis, headache, encephalopathy, viral infection, inflammation, meta-analysis, MRI, neurodegeneration, neuroinflammation, neuroinvasion, neurological, neurological manifestations, neurological symptoms, neurology, neurotropism, olfactory bulb, olfactory epithelium, Parkinson's disease, risk factors, SARS, SARS-CoV-2, stroke, systematic review (n = 28)
2	Long COVID	Antibodies, children, epidemiology, fatigue, healthcare workers, infectious disease, long COVID, prevalence, public health, screening, seroprevalence, symptoms (n = 12)
3	Smell	Coronavirus, gustatory, hypogeusia, hyposmia, infection, olfaction, pandemic, smell, taste, virus (n=10)
4	Anosmia	Ageusia, anosmia, coronavirus infections, dysgeusia, SARS-CoV-2 infection, taste loss (n = 6)
5	Olfactory dysfunction	Olfactory dysfunction, olfactory training, quality of life (n = 3)
6	Recovery	Prognosis, recovery, smell test (n = 3)