1. Central Laboratory, Shaanxi Provincial People's Hospital, Xi'an, Shaanxi 710068, P.R. China
2. Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, Shaanxi 710069, P.R. China
3. Shaanxi Key Laboratory of Ischemic Cardiovascular Disease, Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, Shaanxi 710021, P.R. China
4. Center of Shaanxi Provincial Disease Control and Prevention, Institute of Viral Diseases, Xi'an, Shaanxi 710052, P.R. China