Rosenstein D S, Reif U, Stickle R L, Watson G, Schall W, Amsellem P
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing 48824-1314, USA.
Vet Radiol Ultrasound. 2001 Jul-Aug;42(4):308-10. doi: 10.1111/j.1740-8261.2001.tb00945.x.