1. Department of Pediatrics, West Virginia University, School of Medicine, Morgantown, West Virginia, USA
2. Department of Microbiology, Immunology, and Cell Biology, West Virginia University, School of Medicine, Morgantown, West Virginia, USA
3. Mary Babb Randolph Cancer Center, Robert C. Byrd Health Sciences Center, West Virginia University, School of Medicine, Morgantown, West Virginia, USA