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Appel H, Scheer R, Haibel H, Wu P, Spiller I, Brandt H, Song IH, Rudwaleit M, Thiel A, Sieper J.Appel H, et al. Among authors: song ih.J Rheumatol. 2007 Nov;34(11):2264-70. Epub 2007 Oct 1.J Rheumatol. 2007.PMID: 17918784