1. Biomedical Research Center, Northwest Minzu University; Lanzhou China
2. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute; Chinese Academy of Agricultural Sciences; Lanzhou Gansu China
3. Department of College of Pharmacy; East China University of Science and Technology; Shanghai China
4. College of Veterinary Medicine, Gansu Agricultural University; Lanzhou Gansu China