1. College of Language Intelligence, Sichuan International Studies University, Chongqing 400031, China
2. School of English Studies, Sichuan International Studies University, Chongqing 400031, China
3. Science and Education Department, Chongqing Public Health Medical Center, Chongqing 400036, China
4. Department of Infection Diseases, Chongqing Public Health Medical Center, Chongqing 400036, China