1 Department of Epidemiology, International School of Public Health and One Heath, Hainan Medical University, Haikou 571199, Hainan, China;Department of Epidemiology and Health Statistics, School of Public Health, Xinxiang Medical University, Xinxiang 453003, Henan, China.
2 Department of Epidemiology and Health Statistics, School of Public Health, Xinxiang Medical University, Xinxiang 453003, Henan, China.
3 Department of Epidemiology, International School of Public Health and One Heath, Hainan Medical University, Haikou 571199, Hainan, China.
4 Xinxiang Maternal and Child Health Care Hospital, Xinxiang 453003 Henan, China.