TNF and periodontitis: It contained questions on designs of pathological immunohistochemical stainings to learn more about the immune cell infiltrates that are typical for Sjögren’s syndrome (7), a question on Sjögren and parameters associated with periodontitis (8), and a question on ranking the most effective treatment (anti-tumor necrosis factor (TNF); anti-B-cell, anti-autoimmune-B-cell) based on a table in the study by Kroese et al. (7).