Correction: The PTPN22 1858C/T polymorphism is associated with anti-cyclic citrullinated peptide antibody-positive early rheumatoid arthritis in northern Sweden

Under the heading of ‘Anti-CCP antibody-positive’, the first line should read ‘HLA-shared epitope-negative’, and the second line should read ‘HLA-shared epitope-positive’. Similarly, under the heading ‘Anti-CCP antibody-negative’, the first line should read ‘HLA-shared epitope-negative’ and the second line should read ‘HLA-shared epitope-positive’. The correct table is given here as Table 1 (a corrected version of Table 6 [1]).