1. Global Animal Welfare and Training, Charles River Laboratories, Wilmington, Massachusetts
2. Global Animal Welfare and Training, Charles River Laboratories, Wilmington, Massachusetts; Department of Animal Science, University of California Davis, Davis, California
3. Global Animal Welfare and Training, Charles River Laboratories, Wilmington, Massachusetts; Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada;, Email: patricia.turner@crl.com