1. Department of Animal Science, College of Animal Science and Technology, Northwest A&F University, Xianyang, Shaanxi Province, China;
2. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
3. Department of Biochemistry and Molecular Biology, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi Province, China; and