Defining causality in COVID-19 and neurological disorders. Issue 8 (5th June 2020) - Ellul, Mark; Varatharaj, Aravinthan; Nicholson, Timothy R; Pollak, Thomas Arthur; Thomas, Naomi; Easton, Ava; Zandi, Michael S; Manji, Hadi; Solomon, Tom; Carson, Alan; Turner, Martin R; Kneen, Rachel; et al.