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Chang D, Kim B, Yun Y, Hur Y, Lee Y, Choi M, Yoon J, Seong J.Chang D, et al.Vet Radiol Ultrasound. 2002 Jan-Feb;43(1):37-42. doi: 10.1111/j.1740-8261.2002.tb00440.x.Vet Radiol Ultrasound. 2002.PMID: 11866042
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