1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
2. Chengdu Academy of Agriculture and Forestry Sciences, Chengdu, Sichuan 611130, China
3. School of Public Health, Chengdu Medical College, Chengdu, Sichuan 610500, China
4. College of Life Science, Sichuan Agricultural University, Ya’an, Sichuan 625014, China