Is the T Follicular Regulatory:Follicular Helper T Cell Ratio in Blood a Biomarker for Ectopic Lymphoid Structure Formation in Sjögren's Syndrome? Comment on the Article by Fonseca et al. Issue 8 (22nd June 2018) - Verstappen, Gwenny M.; Nakshbandi, Uzma; Mossel, Esther; Haacke, Erlin A.; van der Vegt, Bert; Vissink, Arjan; Bootsma, Hendrika; Kroese, Frans G. M.