Smoking-associated IgG4-positive cell infiltration in rheumatoid arthritis lung: an exploratory cross-sectional study
IntroductionSmoking is the first recognized modifiable risk factor for IgG4-related disease (IgG4-RD) and a driver of rheumatoid arthritis (RA)-associated interstitial lung disease, yet whether it is associated with IgG4-positive cell infiltration in R…