Warren-Smith C M R, Roe K, de la Puerta B, Smith K, Lamb C R
Department of Veterinary Clinical Sciences, Royal Veterinary College, Hawkshead Lane, North Mymms, Hertfordshire AL9 7TA.
Vet Rec. 2011 Aug 13;169(7):181. doi: 10.1136/vr.d2357. Epub 2011 Jun 27.