TRIM21 and idiopathic interstitial pneumonia: It remains unclear whether the definition of “anti-Ro (SS-A)” in the IPAF criteria meant a mixture of anti-Ro52 and anti-Ro60/SS-A or anti-Ro60/SS-A alone; therefore, our findings suggested that the definition of “anti-Ro (SS-A)” in the IPAF criteria should be clarified and testing anti-Ro52/TRIM21 and anti-Ro60/SS-A separately to identify the autoimmune phenotype in IIP patients.