1. Department of Infection, Third Hospital of Shanxi Medical University, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Taiyuan, China
2. School of Public Health, Shanxi Medical University, Taiyuan, China
3. Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China