Sanders S, Bagley R S, Tucker R L, Nelson N R
Department of Veterinary Clinical Sciences, Washington State University, College of Veterinary Medicine, Pullman 99164-7060, USA.
Vet Radiol Ultrasound. 1999 Mar-Apr;40(2):122-5. doi: 10.1111/j.1740-8261.1999.tb01895.x.