1. Department of Epidemiology and Health Statistics, College of Public Health; Zhengzhou University; Zhengzhou China
2. Department of Prevention and Health Care; The Affiliated Luohu Hospital of Shenzhen University Health Sciences Center; Shenzhen China
3. Department of Preventive Medicine; Shenzhen University Health Sciences Center; Shenzhen China
4. Department of Prevention and Health Care; Military Hospital of Henan Province; Zhengzhou China
5. Intensive Care Unit; Zhoukou City Central Hospital; Zhoukou China