1. Central Experimental Laboratory, Shaanxi Provincial People's Hospital, Key Laboratory of Infection and Immunity of Shaanxi Province, Xi'an, Shaanxi 710068, P.R. China
2. School of Public Health, Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
3. Center of Experimental Animals, The 4th Military Medical University, Xi'an, Shaanxi 710032, P.R. China
4. Department of Pharmacy Medical College of Xi'an Peihua University, Xi'an, Shaanxi 710125, P.R. China