APA

Humphreys J. H., van Nies J. A. B., Chipping J., Marshall T., van der Helm-van Mil A. H. M., Symmons D. P. M. & Verstappen S. M. M. (20151030). Rheumatoid factor and anti-citrullinated protein antibody positivity, but not level, are associated with increased mortality in patients with rheumatoid arthritis: results from two large independent cohorts. : Arthritis research & therapy.

Chicago

Humphreys Jennifer H, van Nies Jessica A B, Chipping Jackie, Marshall Tarnya, van der Helm-van Mil Annette H M, Symmons Deborah P M and Verstappen Suzanne M M. 20151030. Rheumatoid factor and anti-citrullinated protein antibody positivity, but not level, are associated with increased mortality in patients with rheumatoid arthritis: results from two large independent cohorts. : Arthritis research & therapy.

Harvard

Humphreys J. H., van Nies J. A. B., Chipping J., Marshall T., van der Helm-van Mil A. H. M., Symmons D. P. M. and Verstappen S. M. M. (20151030). Rheumatoid factor and anti-citrullinated protein antibody positivity, but not level, are associated with increased mortality in patients with rheumatoid arthritis: results from two large independent cohorts. : Arthritis research & therapy.

MLA

Humphreys Jennifer H, van Nies Jessica A B, Chipping Jackie, Marshall Tarnya, van der Helm-van Mil Annette H M, Symmons Deborah P M and Verstappen Suzanne M M. Rheumatoid factor and anti-citrullinated protein antibody positivity, but not level, are associated with increased mortality in patients with rheumatoid arthritis: results from two large independent cohorts. : Arthritis research & therapy. 20151030.