?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=M&rft.au=Ellul%2C+M&rft.aulast=Ellul&rft.date=5+June+2020&rft.title=Journal+of+Neurology%2C+Neurosurgery+%26+Psychiatry&rft.atitle=Defining+causality+in+COVID-19+and+neurological+disorders&rft.genre=article