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APA Citation
De Rooy, D., Tsonaka, R., Andersson, M., Forslind, K., Zhernakova, A., de Kovel, C., Koeleman, B., van der Heijde, D., Huizinga, T., Toes, R., Houwing-Duistermaat, J., Svensson, B., & van der Helm-van Mil, A. (2013). oP0021 Genetic Factors for the Severity of ACPA-Negative Rheumatoid Arthritis in Two Cohorts of Early Disease: A Genome-Wide Study. Annals of the rheumatic diseases, 72, A55. http://access.bl.uk/ark:/81055/vdc_100137793172.0x00005d