We read with great interest the letter by Baicus [
1] on the stratification of primary Sjögren’s Syndrome (pSS) [
2]. We agree that the discovery of subgroups permitting stratification of pSS could be an important step in the clinical management of patients and the trial design for patients with pSS. In addition to the European cohorts [
3], we note that Lee et al
. report at least three subgroups in a S Korean cohort with long-term stability of subgroup membership at least over a 5-year period of clinical follow-up [
4]. …