RT Journal Article SR Electronic T1 Correspondence on ‘Shared epitope defines distinct associations of cigarette smoking with levels of anticitrullinated protein antibody and rheumatoid factor’ by Ishikawa et al JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP e1 OP e1 DO 10.1136/annrheumdis-2019-216849 VO 81 IS 1 A1 Cristina Regueiro A1 Antonio Gonzalez YR 2022 UL http://ard.bmj.com/content/81/1/e1.abstract AB