2007 journal article
Use of basal serum or plasma cortisol concentrations to rule out a diagnosis of hypoadrenocorticism in dogs: 123 cases (2000-2005)
Journal of the American Veterinary Medical Association, 231(3), 413–416.
By: E. Lennon, T. Boyle, R. Hutchins, A. Friedenthal, M. Correa, S. Bissett, L. Moses, M. Papich , A. Birkenheuer