1. U. S. Geological Survey, Upper Midwest Environmental Sciences Center La Crosse Wisconsin USA
2. College of Veterinary Medicine, Univ. of Florida Gainesville Florida USA
3. Wisconsin Dept of Natural Resources, Science Services Woodruff Wisconsin USA
4. Avian Specialty Veterinary Services Milwaukee Wisconsin USA
5. The Comparative Pathology Laboratory – RARC, Univ. of Wisconsin Madison Wisconsin USA
6. Minnesota Dept of Natural Resources St. Paul Minnesota USA