RT Journal Article SR Electronic T1 Successful BNT162b2 booster vaccinations in a patient with rheumatoid arthritis and initially negative antibody response JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1361 OP 1362 DO 10.1136/annrheumdis-2021-220834 VO 80 IS 10 A1 Fredrik N Albach A1 Gerd R Burmester A1 Robert Biesen YR 2021 UL http://ard.bmj.com/content/80/10/1361.abstract AB