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Licht BG, Lin S, Luo Y, Hyson LL, Licht MH, Harper KM, Sullivan SA, Fernandez SA, Johnston EV.Licht BG, et al.J Am Vet Med Assoc. 2007 Nov 15;231(10):1520-8. doi: 10.2460/javma.231.10.1520.J Am Vet Med Assoc. 2007.PMID: 18020993Free article.