1. Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, 1010 Wire Rd., Auburn, AL 36849 USA
2. Lincoln Memorial University College of Veterinary Medicine, 6965 Cumberland Gap Parkway, Harrogate, TN 37752 USA
3. Virginia-Maryland College of Veterinary Medicine, 205 Duck Pond Dr., Blacksburg, VA 24061 USA
4. Texas Tech University School of Veterinary Medicine, 7671 Evans Dr., Amarillo, TX 79106 USA