1. Jake Gittlen Cancer Research Foundation, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
2. Department of Pathology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
3. Department of Comparative Medicine, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA
4. Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA