Lamb Christopher R, Scrivani Peter V
Department of Veterinary Clinical Sciences, The Royal Veterinary College, University of London, North Mymms, Hertfordshire AL9 7TA, UK.
Vet Radiol Ultrasound. 2009 Sep-Oct;50(5):564-5. doi: 10.1111/j.1740-8261.2009.01584.x.