1. Colorado Division of Wildlife, Research Center, 317 West Prospect, Fort Collins, Colorado 80526, USA
2. National Park Service, Biological Resource Management Division, 1201 Oak Ridge Dr., Suite 200, Fort Collins, Colorado 80525, USA
3. School of Pharmacy, Department 3375, 1000 East University Avenue, University of Wyoming, Laramie, Wyoming 82071, USA
4. Atrix Laboratories, Incorporated, 2579 Midpoint Dr., Fort Collins, Colorado 80525, USA
5. Animal Reproduction and Biotechnology Laboratory, Department of Physiology, Colorado State University, Fort Collins, Colorado 80523, USA