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Bertram HC, Petersen BO, Duus JØ, Larsen M, Raun BM, Kristensen NB.Bertram HC, et al.Acta Vet Scand. 2009 Jun 13;51(1):25. doi: 10.1186/1751-0147-51-25.Acta Vet Scand. 2009.PMID: 19523238Free PMC article.