Gaschen Lorrie, Kircher Patrick, Venzin Claudio, Hurter Karin, Lang Johann
Department of Clinical Veterinary Medicine, Division of Radiology, University of Bern, Switzerland.
Vet Radiol Ultrasound. 2003 Sep-Oct;44(5):553-5. doi: 10.1111/j.1740-8261.2003.tb00506.x.