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Brkic Z, Maria NI, van Helden-Meeuwsen CG, van de Merwe JP, van Daele PL, Dalm VA, Wildenberg ME, Beumer W, Drexhage HA, Versnel MA.Brkic Z, et al. Among authors: beumer w.Ann Rheum Dis. 2013 May;72(5):728-35. doi: 10.1136/annrheumdis-2012-201381. Epub 2012 Jun 26.Ann Rheum Dis. 2013.PMID: 22736090Free PMC article.