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Janssen KMJ, Hop H, Vissink A, Dijkstra G, de Smit MJ, Brouwer E, Westra J. Levels of Anti-Citrullinated Protein Antibodies and Rheumatoid Factor, Including IgA Isotypes, and Articular Manifestations in Ulcerative Colitis and Crohn’s Disease. International Journal of Environmental Research and Public Health. 2020; 17(21):8054. https://doi.org/10.3390/ijerph17218054

Janssen, Koen M. J., Hilde Hop, Arjan Vissink, Gerard Dijkstra, Menke J. de Smit, Elisabeth Brouwer, and Johanna Westra. 2020. "Levels of Anti-Citrullinated Protein Antibodies and Rheumatoid Factor, Including IgA Isotypes, and Articular Manifestations in Ulcerative Colitis and Crohn’s Disease" International Journal of Environmental Research and Public Health 17, no. 21: 8054. https://doi.org/10.3390/ijerph17218054

Janssen, K. M. J., Hop, H., Vissink, A., Dijkstra, G., de Smit, M. J., Brouwer, E., & Westra, J. (2020). Levels of Anti-Citrullinated Protein Antibodies and Rheumatoid Factor, Including IgA Isotypes, and Articular Manifestations in Ulcerative Colitis and Crohn’s Disease. International Journal of Environmental Research and Public Health, 17(21), 8054. https://doi.org/10.3390/ijerph17218054