?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Rutherford&rft.au=Rutherford%2C+MA&rft.aufirst=MA&rft.atitle=Risk+factors+for+severe+outcomes+in+patients+with+systemic+vasculitis+%26+COVID%E2%80%9019%3A+a+bi%E2%80%90national+registry%E2%80%90based+cohort+study&rft.date=22+March+2021&rft.title=Arthritis+%26+Rheumatology&rft.genre=article