1. Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois.
2. Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois.
3. Department of General Surgery, Rush University Medical Center, Chicago, Illinois.
4. Department of Microbiology, Center for Immunology, University of Minnesota, Minneapolis, Minnesota.
5. Rutgers Cancer Institute of New Jersey, Rutgers University, New Brunswick, New Jersey.