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Torsein M, Lindberg A, Sandgren CH, Waller KP, Törnquist M, Svensson C.Torsein M, et al. Among authors: waller kp.Prev Vet Med. 2011 May 1;99(2-4):136-47. doi: 10.1016/j.prevetmed.2010.12.001. Epub 2011 Jan 22.Prev Vet Med. 2011.PMID: 21257214Free PMC article.