Ellul, M., Varatharaj, A., Nicholson, T., Pollak, T., Thomas, N., Easton, A., Zandi, M., Manji, H., Solomon, T., Carson, A., Turner, M., Kneen, R., Galea, I., Pett, S., Thomas, R. & Michael, B. 2020, 'Defining causality in COVID-19 and neurological disorders', Journal of Neurology, Neurosurgery & Psychiatry, 91(8), pp. 811-812. https://doi.org/10.1136/jnnp-2020-323667