1. Brookfield Zoo Chicago, 3300 Golf Rd., Brookfield, Illinois 60513
2. Forest Preserve District of Cook County, 536 N. Harlem Ave., River Forest, Illinois 60305, USA
3. School of Environment and Natural Resources, 210 Kottman Hall, 2021 Coffey Rd., The Ohio State University, Columbus, Ohio 43210, USA
4. Zoological Pathology Program, c/o Chicago Zoological Society, 3300 Golf Rd., Brookfield, Illinois 60513, USA