Altunisik, E., Baykan, A. H., Sahin, S., Aydin, E., & Erturk, S. M. (2021). Quantitative analysis of the olfactory system in COVID-19: An MR imaging study. American Journal of Neuroradiology, 42(12), 2207–2214.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Beck, A. T., Ward, C. H., Mendelson, M., Mock, J., & Erbaugh, J. (1961). An inventory for measuring depression. Archives of General Psychiatry, 4(6), 561–571.

Article  CAS  PubMed  Google Scholar 

Bullmore, E. T., Suckling, J., Overmeyer, S., Rabe-Hesketh, S., Taylor, E., & Brammer, M. J. (1999). Global, Voxel, and cluster tests, by theory and permutation, for a difference between two groups of structural MR images of the brain. IEEE Transactions on Medical Imaging, 18(1), 32–42.

Article  CAS  PubMed  Google Scholar 

Buschhüter, D., Smitka, M., Puschmann, S., Gerber, J. C., Witt, M., Abolmaali, N. D., & Hummel, T. (2008). Correlation between olfactory bulb volume and olfactory function. Neuroimage, 42(2), 498–502.

Article  PubMed  Google Scholar 

Carfì, A., Bernabei, R., & Landi, F. (2020). Persistent symptoms in patients after acute COVID-19. Jama, 324(6), 603–605.

Article  PubMed  PubMed Central  Google Scholar 

Collins, D. L., Neelin, P., Peters, T. M., & Evans, A. C. (1994). Automatic 3D intersubject registration of MR volumetric data in standardized Talairach space. Journal of Computer Assisted Tomography, 18(2), 192–205.

Article  CAS  PubMed  Google Scholar 

Conti, S., Bonazzi, S., Laiacona, M., Masina, M., & Coralli, M. V. (2015). Montreal Cognitive Assessment (MoCA)-Italian version: Regression based norms and equivalent scores. Neurological Sciences, 36, 209–214.

Article  PubMed  Google Scholar 

Cormiea, S., & Fischer, J. (2023). Odor discrimination is immune to the effects of verbal labels. Scientific Reports, 13(1), 1742.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Desikan, R. S., Ségonne, F., Fischl, B., Quinn, B. T., Dickerson, B. C., Blacker, D., Buckner, R. S., Dale, A. M., Maguire, R. P., Hyman, B. T., Albert, M. S., & Killiany, R. J. (2006). An automated labeling system for subdividing the human cerebral cortex on MRI scans into gyral based regions of interest. Neuroimage, 31(3), 968–980.

Article  PubMed  Google Scholar 

Doty, R. L. (2022). Olfactory dysfunction in COVID-19: Pathology and long-term implications for brain health. Trends in Molecular Medicine, 28(9), 781–794.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Ercoli, T., Masala, C., Pinna, I., Orofino, G., Solla, P., Rocchi, L., & Defazio, G. (2021). Qualitative smell/taste disorders as sequelae of acute COVID-19. Neurological Sciences, 42, 4921–4926.

Article  PubMed  PubMed Central  Google Scholar 

Fjaeldstad, A. W., Stiller-Stut, F., Gleesborg, C., Kringelbach, M. L., Hummel, T., & Fernandes, H. M. (2021). Validation of olfactory network based on brain structural connectivity and its association with olfactory test scores. Frontiers in Systems Neuroscience, 15, 638053.

Article  PubMed  PubMed Central  Google Scholar 

Frosolini, A., Parrino, D., Fabbris, C., Fantin, F., Inches, I., Invitto, S., Spinato, G., & De Filippis, C. (2022). Magnetic resonance imaging confirmed olfactory bulb reduction in long COVID-19: Literature review and case series. Brain Sciences, 12(4), 430.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Gottfried, J. A. (2010). Central mechanisms of odour object perception. Nature Reviews Neuroscience, 11(9), 628–641.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Hedner, M., Larsson, M., Arnold, N., Zucco, G. M., & Hummel, T. (2010). Cognitive factors in odor detection, odor discrimination, and odor identification tasks. Journal of Clinical and Experimental Neuropsychology, 32(10), 1062–1067.

Article  PubMed  Google Scholar 

Hintschich, C. A., Fischer, R., Hummel, T., Wenzel, J. J., Bohr, C., & Vielsmeier, V. (2022). Persisting olfactory dysfunction in post-COVID-19 is associated with gustatory impairment: Results from chemosensitive testing eight months after the acute infection. PLoS One, 17(3), e0265686.

Huang, C., Huang, L., Wang, Y., et al. (2021). 6-month consequences of COVID-19 in patients discharged from hospital: A cohort study. Lancet, 397(10270), 220–232.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Hummel, T., Sekinger, B., Wolf, S. R., Pauli, E., & Kobal, G. (1997). Sniffin’sticks’: Olfactory performance assessed by the combined testing of odor identification, odor discrimination and olfactory threshold. Chemical Senses, 22(1), 39–52.

Article  CAS  PubMed  Google Scholar 

Hummel, T., Damm, M., Vent, J., Schmidt, M., Theissen, P., Larsson, M., & Klussmann, J. P. (2003). Depth of olfactory sulcus and olfactory function. Brain Research, 975(1–2), 85–89.

Article  CAS  PubMed  Google Scholar 

Hummel, T., Kobal, G., Gudziol, H., & Mackay-Sim, A. J. E. A. (2007). Normative data for the Sniffin’sticks including tests of odor identification, odor discrimination, and olfactory thresholds: An upgrade based on a group of more than 3,000 subjects. European Archives of Oto-Rhino-Laryngology, 264, 237–243.

Article  CAS  PubMed  Google Scholar 

Hummel, T., Whitcroft, K. L., Andrews, P., et al. (2017). Position paper on olfactory dysfunction. Rhinology, 54, 1–30.

Article  CAS  PubMed  Google Scholar 

Joshi, A., Hornstein, H., Thaploo, D., Faria, V., Warr, J., & Hummel, T. (2023). Neural processing of odors with different well-being associations—findings from two consecutive neuroimaging studies. Brain Sciences, 13(4), 576.

Article  PubMed  PubMed Central  Google Scholar 

Lamyae Benzakour, Patrice, H., Lalive, K. O., Lövblad, O., Braillard, M., Nehme, M., Coen, J., Serratrice, J. L., & Reny Jérôme Pugin, Idris Guessous, Basile N Landis, Alessandra Griffa, Dimitri Van De Ville, Frederic Assal, Julie A Péron.

Landis, B. N., Welge-Luessen, A., Brämerson, A., Bende, M., Mueller, C. A., Nordin, S., & Hummel, T. (2009). Taste Strips–a rapid, lateralized, gustatory bedside identification test based on impregnated filter papers. Journal of Neurology, 256, 242–248.

Article  PubMed  Google Scholar 

Lv, H., Wang, Z., Tong, E., et al. (2018). Resting-state functional MRI: Everything that nonexperts have always wanted to know. American Journal of Neuroradiology, 39(8), 1390–1399.

CAS  PubMed  PubMed Central  Google Scholar 

Masala, C., Saba, L., Cecchini, M. P., Solla, P., & Loy, F. (2018). Olfactory function and age: A sniffin’sticks extended test study performed in Sardinia. Chemosensory Perception, 11, 19–26.

Article  Google Scholar 

Masala, C., Käehling, C., Fall, F., & Hummel, T. (2019). Correlation between olfactory function, trigeminal sensitivity, and nasal anatomy in healthy subjects. European Archives of Oto-Rhino-Laryngology, 276, 1649–1654.

Article  PubMed  Google Scholar 

Muccioli, L., Sighinolfi, G., Mitolo, et al. (2023). Cognitive and functional connectivity impairment in post-COVID-19 olfactory dysfunction. NeuroImage: Clinical, 38, 103410.

Article  PubMed  Google Scholar 

Nasreddine, Z. S., Phillips, N. A., Bédirian, V., Charbonneau, S., Whitehead, V., Collin, I., Cummings, J. L., & Chertkow, H. (2005). The Montreal Cognitive Assessment, MoCA: A brief screening tool for mild cognitive impairment. Journal of the American Geriatrics Society, 53(4), 695–699.

Article  PubMed  Google Scholar 

Nieto-Castanon, A. (2020). Handbook of functional connectivity magnetic resonance imaging methods in CONN. Hilbert.

Nigri, A., Ferraro, S., D’Incerti, L., Critchley, H. D., Bruzzone, M. G., & Minati, L. (2013). Connectivity of the amygdala, piriform, and orbitofrontal cortex during olfactory stimulation: A functional MRI study. Neuroreport, 24(4), 171–175.

Article  PubMed  Google Scholar 

Oleszkiewicz, A., Schriever, V. A., Croy, I., Haehner, A., & Hummel, T. (2019). Updated Sniffin’sticks normative data based on an extended sample of 9139 subjects. European Archives of Oto-rhino-laryngology, 276, 719–728.

Article  CAS  PubMed  Google Scholar 

Ousseiran, Z. H., Fares, Y., & Chamoun, W. T. (2023). Neurological manifestations of COVID-19: A systematic review and detailed comprehension. International Journal of Neuroscience, 133(7), 754–769.

Article  CAS  PubMed