Foster, S. F., Church, D. B., & Watson, A. D. J. Effect of phenobarbitone on the low-dose dexamethasone suppression test and the urinary corticoid: creatinine ratio in dogs. AUSTRALIAN VETERINARY JOURNAL, 78(1), 19-23. https://doi.org/10.1111/j.1751-0813.2000.tb10349.x