Corrigendum: Increased Binding of Specificity Protein 1 to the IL21R Promoter in B Cells Results in Enhanced B Cell Responses in Rheumatoid Arthritis - Dam, Elizabeth M.; Maier, Alison C.; Hocking, Anne M.; Carlin, Jeffrey; Ng, Bernard; Buckner, Jane H. (Frontiers in Immunology, 2019)