Rose Patricia L, Moore Ian
Department of Companion Animals, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, Canada C1A 4p3.
Vet Radiol Ultrasound. 2003 Nov-Dec;44(6):657-9. doi: 10.1111/j.1740-8261.2003.tb00528.x.