Uslar, D., Cooperativa Agrícola y Lechera de La Unión, La Unión, Chile.
Uslu, S., University of Yüzüncü Yil, Faculty of Veterinary Medicine, Department of Histology and Embryology, Kampus, 65080, Van, Turkey.
Utrera-Quintana, F., Facultad de Medicina Veterinaria y Zootecnia, Benemérita Universidad Autónoma de Puebla, Tecamachalco, Puebla, México.
UZAL, F. A., Division of Veterinary Pathobiology, School of Veterinary Sciences, The University of Queensland. Brisbane Qld 4072, Australia.
UZAL, F. A., Animal Health Unit, The National Institute of Agricultural Technology, CC 277, (8400) Bariloche, Argentina. (Argentina)

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