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Van Hoovels L, Vander Cruyssen B, Sieghart D, et al. Multicentre study to improve clinical interpretation of rheumatoid factor and anti-citrullinated protein/peptide antibodies test results. RMD Open 2022;8:e002099. doi:10.1136/rmdopen-2021-002099
Xavier Bossuyt has been added as a corresponding author.