Anti-citrullinated protein antibody positive rheumatoid arthritis is primarily determined by rheumatoid factor titre and the shared epitope rather than smoking per se

• Dan Murphy ,

  Contributed equally to this work with: Dan Murphy, Derek Mattey, David Hutchinson

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Validation, Writing – original draft, Writing – review & editing

  * E-mail: Daniel.murphy8@nhs.net

  Affiliations Department of Rheumatology, Royal Cornwall Hospital Trust, Truro, Cornwall, United Kingdom, University of Exeter Medical School (Knowledge Spa, Cornwall Campus, Truro), Cornwall, United Kingdom

  http://orcid.org/0000-0001-9998-5265

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• Derek Mattey ,

  Contributed equally to this work with: Dan Murphy, Derek Mattey, David Hutchinson

  Roles Data curation, Investigation, Methodology, Resources, Software, Validation, Visualization, Writing – review & editing

  Affiliations Haywood Rheumatology Centre, Haywood Hospital, Stoke-on-Trent, United Kingdom, Institute for Science and Technology in Medicine, Keele University, Keele, Staffordshire, United Kingdom

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• David Hutchinson

  Contributed equally to this work with: Dan Murphy, Derek Mattey, David Hutchinson

  Roles Conceptualization, Funding acquisition, Methodology, Project administration, Supervision, Visualization, Writing – review & editing

  Affiliations Department of Rheumatology, Royal Cornwall Hospital Trust, Truro, Cornwall, United Kingdom, University of Exeter Medical School (Knowledge Spa, Cornwall Campus, Truro), Cornwall, United Kingdom

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