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Hatt JM, Zollinger E, Boehler A, Hofer M, Steinmetz HW, Clauss M.Hatt JM, et al. Among authors: hofer m.Vet Rec. 2009 Oct 17;165(16):469-73. doi: 10.1136/vr.165.16.469.Vet Rec. 2009.PMID: 19850854Free article.