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Popa C, van den Hoogen FH, Radstake TR, Netea MG, Eijsbouts AE, den Heijer M, van der Meer JW, van Riel PL, Stalenhoef AF, Barrera P.Popa C, et al.Ann Rheum Dis. 2007 Nov;66(11):1503-7. doi: 10.1136/ard.2006.066191. Epub 2007 May 1.Ann Rheum Dis. 2007.PMID: 17472994Free PMC article.Clinical Trial.