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Head E, Zicker SC.Head E, et al.Vet Clin North Am Small Anim Pract. 2004 Jan;34(1):217-28. doi: 10.1016/j.cvsm.2003.09.007.Vet Clin North Am Small Anim Pract. 2004.PMID: 15032129Review.
Head E, Rofina J, Zicker S.Head E, et al.Vet Clin North Am Small Anim Pract. 2008 Jan;38(1):167-78, vi. doi: 10.1016/j.cvsm.2007.10.002.Vet Clin North Am Small Anim Pract. 2008.PMID: 18249248Free PMC article.Review.