1. The Hiram C. Polk Jr, MD, Department of Surgery, University of Louisville School of Medicine, Louisville, KY, USA
2. Department of Histology, School of Medicine, Autonomous University of Nuevo León, Monterrey, N.L. México
3. James Graham Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY, USA
4. Department of Microbiology and Immunology, Institute for Cellular Therapeutics, University of Louisville, Louisville, KY, USA