1. China Animal Health and Epidemiology Center, Qingdao, People’s Republic of China
2. College of Animal Science and Technology & College of Veterinary Medicine, Zhejiang Agriculture and Forestry University, Hangzhou, People’s Republic of China
3. College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, People’s Republic of China
4. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, People’s Republic of China