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Gaskill, C. L., Burton, S. A., Gelens, H. C. J., Ihle, S. L., Miller, J. B., Shaw, D. H., … Cribb, A. E. (1999). Effects of phenobarbital treatment on serum thyroxine and thyroid-stimulating hormone concentrations in epileptic dogs. Journal Of The American Veterinary Medical Association, 215(4), 489-496.