1. Department of Epidemiology , College of Public Health, , Zhengzhou , China
2. Zhengzhou University , College of Public Health, , Zhengzhou , China
3. DeltaMed Solutions Inc. , 220 Davidson Avenue, Suite 201, Somerset, NJ 08873 , USA
4. First Affiliated Hospital and International School of Public Health and One Health, Hainan Medical University , Haikou 570102 , China