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Schiphof D, Kerkhof HJ, Damen J, de Klerk BM, Hofman A, Koes BW, van Meurs JB, Bierma-Zeinstra SM.Schiphof D, et al.Arthritis Care Res (Hoboken). 2013 May;65(5):695-702. doi: 10.1002/acr.21886.Arthritis Care Res (Hoboken). 2013.PMID: 23203619Free article.Clinical Trial.