Ringger N C, Brown M P, Kohlepp S J, Gronwall R R, Merritt K
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610-0136, USA.
Equine Vet J. 1998 Mar;30(2):163-5. doi: 10.1111/j.2042-3306.1998.tb04477.x.