Relevance of Interferon‐Inducible Protein‐16 Rather than Anti–Interferon‐Inducible Protein‐16 Autoantibodies as a Clinical and Pathogenic Biomarker in Primary Sjögren's Syndrome: Comment on the Article by Baer et al. Issue 3 (March 2017) - Alunno, Alessia; Bartoloni, Elena; Bistoni, Onelia; Gerli, Roberto; Caneparo, Valeria; Carubbi, Francesco; Landolfo, Santo