1. Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Esperanza, Santa Fe, Argentina.
2. Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, California.
3. Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, California.
4. Veterinary Genetics Laboratory, School of Veterinary Medicine, University of California, Davis, California.