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de Groot IB, Reijman M, Terwee CB, Bierma-Zeinstra SM, Favejee M, Roos EM, Verhaar JA.de Groot IB, et al.Osteoarthritis Cartilage. 2007 Jan;15(1):104-9. doi: 10.1016/j.joca.2006.06.014. Epub 2006 Aug 4.Osteoarthritis Cartilage. 2007.PMID: 16890460Free article.
Van Middelkoop M, Kolkman J, Van Ochten J, Bierma-Zeinstra SM, Koes B.Van Middelkoop M, et al.Scand J Med Sci Sports. 2008 Apr;18(2):140-4. doi: 10.1111/j.1600-0838.2007.00683.x. Epub 2007 Jun 6.Scand J Med Sci Sports. 2008.PMID: 17555538
Van Middelkoop M, Kolkman J, Van Ochten J, Bierma-Zeinstra SM, Koes BW.Van Middelkoop M, et al.Scand J Med Sci Sports. 2008 Dec;18(6):691-7. doi: 10.1111/j.1600-0838.2007.00768.x. Epub 2008 Feb 4.Scand J Med Sci Sports. 2008.PMID: 18266787