1. State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
2. Key Laboratory of Preventive Veterinary Medicine in Hubei Province, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
3. Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
4. Department of Pathology, University of Georgia, Athens, Georgia, USA