1. Sichuan Key Laboratory of Conservation Biology for Endangered Wildlife, Chengdu Research Base of Giant Panda Breeding, Chengdu, Sichuan, China
2. Department of Microbiology, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, China
3. School of Geography and Tourism, Harbin University, Harbin, Heilongjiang, China
4. Daxiangling Provincial Nature Reserve, Yaan, Sichuan, China
5. Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China