1. U.S. Food and Drug Administration, Office of Regulatory Affairs, Animal Drugs Research Center, Denver Federal Center Bldg 20, W. 6th Ave and Kipling St, Denver, CO 80225, USA
2. U.S. Food and Drug Administration, Office of Regulatory Affairs, Denver Laboratory, Denver Federal Center Bldg 20, W. 6th Ave and Kipling St, Denver, CO 80225
3. U.S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Ln, Wyndmoor, PA 19038