USDA (2000). Rats, mice and birds database: researchers, breeders, transporters, and exhibitors. A database prepared by the federal Research Division, Library of Congress under an Interagency Agreement with the United States Department of Agriculture's Animal Plant Health Inspection Service, August 2000.Washington, DC, USA:United States Department of Agriculture: Animal and Plant Health Inspection Service. Available at: http://www.aphis.usda.gov/ac/locreport.html (Accessed 21.02.08).