By Tranquilli, William J., Thurmon, John C., Grimm, Kurt A.
By Peter Cockcroft (Cambridge Expert VETS), Mark Holmes (University of Cambridge Veterinary School)
By P. J. Quinn, B. K. Markey, M.E. Carter, W.J. Donnelly, F. C. Leonard
By Jill E. Maddison, Mark G. Papich
By Stockham, Steven L., Scott, Michael A.
By Aviva Petrie, Paul Watson
