1. Biologic Resources Laboratory, University of Illinois at Chicago, Chicago, Illinois; Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, Texas
2. Biologic Resources Laboratory, University of Illinois at Chicago, Chicago, Illinois
3. Illinois Statistics Office, Department of Statistics, University of Illinois at Urbana-Champaign, Champaign, Illinois
4. Biologic Resources Laboratory, University of Illinois at Chicago, Chicago Illinois;, Email: dingjdutton@txbiomed.org