RT Journal Article SR Electronic T1 What is the true incidence of COVID-19 in patients with rheumatic diseases? JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP e18 OP e18 DO 10.1136/annrheumdis-2020-217615 VO 80 IS 2 A1 Favalli, Ennio Giulio A1 Ingegnoli, Francesca A1 Cimaz, Rolando A1 Caporali, Roberto YR 2021 UL http://ard.bmj.com/content/80/2/e18.abstract AB